hi I have the same issue - internet works fine most of the time, but especially on wifi calls or streaming, calls drop after about 4 mins, and some streaming apps don't work. This is really annoying because with the dome antenna the modem work perfectly and he range is excellent. I have another router (iogiant) using the same card, works fine and doesn't drop - so definitely the RUT950.
I have updated to the latest firmware and modem software this week but still drops. Please help!