It never Rains but pours.

We have had the 5G Router for 3 weeks. We have been struggling with days of disconnection. Today we have not manage to keep a connected signal for longer than 15 min. We have done everything. The signal is excellent and drops to no internet at all. Logged calls. They said they will phone as soon as the signal drops. No 1 call in 2 hours with constant dropping, rebooting or resetting