Hi guys, thanks again for the help. There is no backup WAN for the device. The connection is very rural and options are severely limited. We purchased the Peplink to use with a Verizon card that we were ultimately unable to troublshoot problems with (throughput dropped to essentially 0 every 20-30 minutes). Then we went with the Sprint connection which is through a non-profit for educational status. But we are using their hotspot (a ZTE WarpConnect) and I worry that putting the card directly into our Mini might cause us to lose the unlimited connection or get throttled… so we’re using Wifi as WAN. The ZTE Warp Connect with NOT let me change the DNS. Also, I’ve read that even if you change it, Sprint still hijacks. Things seem better right now though we’re still having some weird issues with wireless devices (that isn’t happening with wired connections) and timeouts here and there. I will contact Sprint if things seem to get really bad again.
I’ll also look into DNS caching.