Wireless Joint

I have an em20 in a wg1608 but I get disconnects even with the larger power supply. It looks as if the modem get up to 69 C and then resets? Not sure if this is solely a heat issue or if it’s a router issue?

What would be a stable router with 4 antenna connection to use. Wifi connection would be helpful but not critical cuz I would connect router directly into the network via Ethernet.

Thanks in advance.