WS1208v2 + quectel RM520N-GL (T-Mobile)

[superman4283]

I can turn on the router and my Internet works great for about 15 minutes. After about 15 minutes I no longer have Internet. If I turned the router off and turn it back on the Internet will work for about 15 minutes again. I'm not sure why it keeps dropping Internet. Any advice or help would be appreciated. If you need more information i'll be glad to post it.

[BillA]

Disconnect WiFi (turn on airplane mode in Windows), and connect it to the router via an ethernet cable (make sure WiFi is turned off). If it works beyond 15 minutes, it's may be due to bad WiFi chip on the router or the computer.
Flash the router with the latest GoldenOrb firmware, do a factory reset, then test it with the default settings.
http://www.aturnofthenut.com/autobuilds/

If it's still disconnecting over both ethernet and WiFi, it may be a modem, or carrier issue.
Flash the modem with the latest firmware, search for it by the exact model number.
If it's still disconnecting, insert a different carrier's sim card into the router for testing (make sure to select the proper APN/TTL),
If it's still disconnecting, it may be a defective router.