"cold Blooded" hotspot : frequent internet connection failures. ... why do they happen

**Short Story shorter**
Hotspot denies internet access to Puppy Linux client only on a specific laptop while all other clients have no issue ( the same laptop with Windows partition can connect without any issue ) and the only way I could fix it is "reset network settings" + reboot. Nothing else seems to work. **Scenario**
2 Mobile phones : 1 Culprit Xiaomi H1 and 1 AT & T ( control ) H2 Here is the picture cheat sheeted normal laptop NL Problem laptop PL Problem hotspot # 1 H1 Ok hotspot # 2 - H2 puppy refers to the puppy Linux partition on the laptop so e.g. PL.Puppy ❌ H1 means puppy Linux on PL aka problem laptop does not have internet connection via hotspot H1 PL.Puppy ❌ H1 PL.Puppy ✓ H2 PL.WIndows ✓ H1 NL ✓ H 1 && H2 I am able to ping the gateway 192.168.43.1 & traceroute e.g. www.yahoo.com will resolve the hostname to IP but there will be no progress and it will time out and die. this seems too strongly suggest that the gateway which is the hotspot itself is not allowing internet access. **Question**
--Why does my hotspot only on a specific phone keep denying internet access ( unless of course the issue is at the client aka laptop end but seems that's not the case )
--How can I do equivalent of "reset network setting" using adb and then avoid reboot ( delete part of dalvik or /cache ? if so which specific files / folders )