Sony Xperia ZR wifi problem: wpa_supplicant: wlan0: CTRL-EVENT-ASSOC-REJECT

I have a strange problem with Wi-Fi with my Sony Xperia. I can't connect to most of the networks I have tried, but the list of networks is ok (but somehow slowly loaded). **It stopped working suddenly after a week**. My previously used networks are all marked as "Saved", but when I try to connect the following happens: 1. Saved (doesn't even change when tapped) 2. Connecting -> Saved 3. Connecting -> Authentication problem -> Saved This is what I have tried to fix it: 1. Restart phone 2. Restart phone, take out battery, SD card and SIM card 3. Restart wi-fi router 4. Connect to another network (sometimes works with some networks) 5. Forget network -> Type password again 6. Connect another Android device to the same network 7. Connect another non-android device to the same network 8. Change the router wireless settings to WEP, WPA and unsecured 9. Factory reset of the router 10. Sony Companion -> Repair 11. Factory reset of the phone Router: D-Link DIR-615 Phone: Sony Xperia ZR C5502 Android version: 4.1.2 Baseband: 9x15A-ACEFWMAZQ-30110041-29 Build number: 10.1.1.A.1.310 Kernel: 3.4.0-g6df7905-02327-g1aa3092 BuildUser@BuildHost) ) #1 SMP PREEMPT Thu Apr 11 11:17:13 2013 Log after turning on the wifi and trying to connect: 09-18 09:10:08.116: I/WifiManager(2391): Process ndroid.settings enabled Wifi 09-18 09:10:08.186: E/WifiHW(571): File "/data/misc/wifi/WCNSS_qcom_cfg.ini" exists, not copying 09-18 09:10:08.497: I/wpa_supplicant(3838): nl80211: Don't connect to APs with RSSI < 0 09-18 09:10:08.497: I/wpa_supplicant(3838): rfkill: Cannot open RFKILL control device 09-18 09:10:08.497: I/ActivityManager(571): No longer want com.google.android.onetimeinitializer (pid 1747): hidden #51 09-18 09:10:08.637: I/wpa_supplicant(3838): wapi_supplicant_init: Init WAI packet p2p0 09-18 09:10:08.637: I/wpa_supplicant(3838): Own MAC address: (Here's phone MAC address) 09-18 09:10:08.637: E/wpa_supplicant(3838): Initialization: WAPI:set Staues=1 09-18 09:10:08.657: E/Diag_Lib(3838): Diag_LSM_Init: Failed to open handle to diag driver, error = 13 09-18 09:10:08.757: E/wpa_supplicant(3838): QMI_UIM_EVENT_REG_REQ_V01, qmi_err_code: 0x0 09-18 09:10:08.777: E/wpa_supplicant(3838): QMI_UIM_GET_CARD_STATUS_REQ_V01, qmi_err_code: 0x0 09-18 09:10:08.777: E/wpa_supplicant(3838): card_info[i].card_state: 0x1 09-18 09:10:08.777: E/wpa_supplicant(3838): card_info[i].error_code: 0x0 09-18 09:10:08.777: E/wpa_supplicant(3838): card READY 09-18 09:10:08.777: E/wpa_supplicant(3838): card_info[i].app_type : 0x2 09-18 09:10:08.777: E/wpa_supplicant(3838): card_info[i].app_state : 0x7 09-18 09:10:08.777: E/wpa_supplicant(3838): card found 09-18 09:10:08.797: I/wpa_supplicant(3838): Reading GSM home network domain configuration file '/system/etc/wifi/gsm_domains.conf' 09-18 09:10:08.877: I/wpa_supplicant(3838): nl80211: Don't connect to APs with RSSI < -83 09-18 09:10:08.877: I/wpa_supplicant(3838): rfkill: Cannot open RFKILL control device 09-18 09:10:08.917: I/wpa_supplicant(3838): wapi_supplicant_init: Init WAI packet wlan0 09-18 09:10:08.917: I/wpa_supplicant(3838): Own MAC address: (Here's phone MAC address) 09-18 09:10:08.917: E/wpa_supplicant(3838): Initialization: WAPI:set Staues=1 09-18 09:10:08.957: E/wpa_supplicant(3838): QMI_UIM_EVENT_REG_REQ_V01, qmi_err_code: 0x0 09-18 09:10:08.977: E/wpa_supplicant(3838): QMI_UIM_GET_CARD_STATUS_REQ_V01, qmi_err_code: 0x0 09-18 09:10:08.977: E/wpa_supplicant(3838): card_info[i].card_state: 0x1 09-18 09:10:08.977: E/wpa_supplicant(3838): card_info[i].error_code: 0x0 09-18 09:10:08.977: E/wpa_supplicant(3838): card READY 09-18 09:10:08.977: E/wpa_supplicant(3838): card_info[i].app_type : 0x2 09-18 09:10:08.977: E/wpa_supplicant(3838): card_info[i].app_state : 0x7 09-18 09:10:08.977: E/wpa_supplicant(3838): card found 09-18 09:10:09.037: E/WifiConfigStore(571): Failed to look-up a string: W 09-18 09:10:09.037: E/WifiConfigStore(571): Failed to look-up a string: SMS4 09-18 09:10:09.037: E/WifiConfigStore(571): Failed to look-up a string: SMS4 09-18 09:10:09.077: I/WifiManager(2391): Process ndroid.settings requested an active scan 09-18 09:10:09.087: E/Parcel(334): Reading a NULL string not supported here. 09-18 09:10:09.087: E/Parcel(334): Reading a NULL string not supported here. 09-18 09:10:09.097: E/Parcel(334): Reading a NULL string not supported here. 09-18 09:10:09.097: I/SuperStamina-WifiAnalyzer(571): WiFi is ON. 09-18 09:10:09.117: E/wifidirect(3726): onStartCommand 1 09-18 09:10:09.117: E/wifidirect(3726): Exitting file transfer service. 09-18 09:10:09.117: W/wpa_supplicant(3838): wlan0: Failed to initiate AP scan 09-18 09:10:09.117: W/wpa_supplicant(3838): p2p0: Failed to initiate AP scan 09-18 09:10:09.127: E/wifidirect(3726): onStartCommand 1 09-18 09:10:09.127: E/wifidirect(3726): Exitting file transfer service. 09-18 09:10:10.128: W/wpa_supplicant(3838): wlan0: Failed to initiate AP scan 09-18 09:10:11.119: W/wpa_supplicant(3838): wlan0: Failed to initiate AP scan 09-18 09:10:12.130: W/wpa_supplicant(3838): wlan0: Failed to initiate AP scan 09-18 09:10:12.811: I/wpa_supplicant(3838): wlan0: Trying to associate with (here is my router MAC) (SSID='smartus@unifi' freq=2427 MHz) 09-18 09:10:14.023: I/wpa_supplicant(3838): wlan0: CTRL-EVENT-ASSOC-REJECT bssid=(here is my router MAC) status_code=1 09-18 09:10:19.088: I/WifiManager(2391): Process ndroid.settings requested an active scan 09-18 09:10:22.812: I/wpa_supplicant(3838): wlan0: Authentication with (here is router MAC) timed out. These lines will later repeat: 09-18 09:10:12.811: I/wpa_supplicant(3838): wlan0: Trying to associate with (here is my router MAC) (SSID='smartus@unifi' freq=2427 MHz) 09-18 09:10:14.023: I/wpa_supplicant(3838): wlan0: CTRL-EVENT-ASSOC-REJECT bssid=(here is my router MAC) status_code=1 09-18 09:10:19.088: I/WifiManager(2391): Process ndroid.settings requested an active scan 09-18 09:10:22.812: I/wpa_supplicant(3838): wlan0: Authentication with (here is router MAC) timed out. Any ideas what could cause CTRL-EVENT-ASSOC-REJECT? I believe this is usually happening when the network is congested (there are only 3 devices, 2 of them work. The phone won't work in the network alone neither).