SWG-M202 gsm gateway freezes every 50 days

Hello! I have a SWG-M202 gsm gateway, which freezes every 50 days. When it happens I can only restart it with cutting the power (the web interface also not reachable). I tried to update the firmware, but this didn't helped. What can cause this?

Hello

Which firmware version do you use ?
www.openvox.cn/pub/firmwares/Wireless_Ga...swg-m20x-current.bin This is the lastest version .

I have the 1.0.16, but the issus also was with the 1.0.12, 1.0.14, this is the reason why I updated to 1.0.16. And I'm not seeing anything related in the changelog.

This is www.openvox.cn/pub/firmwares/Wireless_Gateway/M20X/ChangeLog
lastest is 1.1.2, update and reset and re-configure to have a look .