Netgear Nighthawk M1

Since updating my MR1100 3 weeks ago, I am not able to see what my usage is, all that is showing us 'detecting service'. This is very inconvenient, as I don't want to run over my monthly allowance. Also when charging, it stops charging at approximately 3/4 capacity, and says 'charging stopped due to overheating'. I don't feel this is correct, as neither of these problems occurred before the update!  I visited my local Telstra shop to ask their advice, and they reset it, and said the problem would eventually resolve itself. So far this has not happened, and I am getting very frustrated with the MR1100, please help.