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By gregstewart90
#69044 I'm using the ESP-07S modules and programming them using the Arduino IDE. The modules connect via WIFI to the internet and relay sensor info to a server. They worked great at first, but after about a month, most of my 30 modules will no longer connect to the network. I pulled one out and uploaded the simple WIFIScan sketch but the scan returned 0 networks. I then uploaded the WIFIAccessPoint sketch and I successfully connected to the network created by the esp. I tried erasing the flash with the esptool.py to see if it would help, but I'm still unable to find any networks with a scan.

I found this article about crystal degradation, but I'm not sure if that is the problem, and if it is, I'm not sure how I would fix it.