WE3926 T-Mobile issue

I recently got into the modded router. I have a WE3926 running OPENWRT firmware. The issue I'm having is I notice that while I'm using the t-mobile sim card (TTL is set to 65) it will lose connection for a minute to 2 minutes then work again then lose it again. Are there any patches I need to try or anything else?

Thank you in advance for your help.