I am suffering connectivity issues with ESP8266 andf ESP32 devices for a long time now. 

The devices seems to loose the WiFi connection, or get disconnected with other services (like MQTT), have a poor response rate. 

All the obvious already tried:

Deco System:

- Fast roaming disabled

- Mesh for these devices disabled (as they are static to the same place)

- forced to connect on 2.4Ghz

- Dynamic IP  -or Static IP does not make a differenc.

On Device:

- Sleep mode disabled, ie. always on, no wlan sleeps

- increased ARP times

- increased keepAlive times

But to no avail. It is also not depended on the firmware of these devices, some run Tasmota, some run own firmware thats many years old. All have the same connectivity issues. 

Any help would be appreciated.