Macbook 12" doesn't sleep/wake on close/open

I bought an Macbook 12" 2016 which doesn't want so sleep when I close the lid. Furthermore it also doesn't want so start if I open the lid. I tried resetting the SMC and NCRAM, then I reinstalled MACOS. Nothing helped. I also tried to get it so sleep with magnets, this worked out quiet well, so I don't think that the sensors are broken. Here is my pmset -g output:

System-wide power settings:
Currently in use:
 lidwake              1
 autopoweroff         1
 standbydelayhigh     86400
 autopoweroffdelay    259200
 standbydelaylow      10800
 standby              1
 proximitywake        0
 ttyskeepawake        1
 hibernatemode        3
 gpuswitch            2
 powernap             0
 hibernatefile        /var/vm/sleepimage
 highstandbythreshold 50
 displaysleep         2
 sleep                1
 acwake               0
 halfdim              1
 tcpkeepalive         1
 disksleep            10

and my pmset -g assertion output:

Assertion status system-wide:
   BackgroundTask                 0
   ApplePushServiceTask           0
   UserIsActive                   1
   PreventUserIdleDisplaySleep    0
   PreventSystemSleep             0
   ExternalMedia                  0
   PreventUserIdleSystemSleep     0
   NetworkClientActive            0
Listed by owning process:
   pid 142(WindowServer): [0x0000001800098047] 00:00:00 UserIsActive named: "com.apple.iohideventsystem.queue.tickle serviceID:100000271 name:AppleHIDKeyboardEve product:Apple Internal Keyb eventType:3"  
	Timeout will fire in 120 secs Action=TimeoutActionRelease
No kernel assertions.
Idle sleep preventers: IODisplayWrangler

Thanks for your help!