Shelly 2.5 Roller lost connection

Hello!

I use 2 Shelly 2.5 in Roller Mode.

It works for more than 6 months but in the last month the connection to my AP get lost after a few hours. After that I disconnect the power and after a few seconds I got a connection. I tried a full reset and it also don't work for some hours. I updated the firmware to the latest version, also with no success. Do you have any idea what i can try now?

Thank you very much.

WiFi RSSI: -54 dBm

Supply voltage: 228.67 V

• Shelly Type: Shelly 2.5
• Device Mode (if Shelly Type is Shelly 2.5) : Roller
• Firmware Version: 20201202-140039/v1.9.3-rc3@50c6ab57
• Router or AccessPoint: Router
  
• Static IP or DHCP: Static
  

After update to 1.9.3 (official) it works for me!