My archer mr600 is dropping its 4g signal about 10 times a day only solution is a power reset. Installed about 18months ago, dropping signal once or twice a day. 

Has latest firmware. Running on movistar sim in rural Spain. 

Is running a mesh with couple of re305.

Wi-Fi remains on but lose internet signal.

Switching my phone to 4g it finds the Movistar 4g without a problem when router is saying no connection to the internet. 

Appreciate any suggestions on how to make more stable or for getting the router to reboot itself.