Esp32-wroom-32E stop connecting to WiFi

Question

I am working on a project i.e. Energy Meter in which Esp32_wroom-32E is being used by me. When I install the device in clients homes. they work fine for a week or so and then Wifi connection issues start. I had also run a timer which checks every 3 minutes if WiFi is connected or not. It tries to disconnect and again connects to WiFi. But sometimes the device does'nt connect. What can be issue.

I tried to run a loop to check WiFi connectivity and then try to connect if not but it seems like some other issue.