I empathise completely with your frustrations since your experience sounds very familiar e.g. WTF is "loss"???
Some ppl in support these days really do seem to be paid on how quickly they can fob you off with any old excuse i.e. it must be your [insert random h/w or s/w element].
I've had to ask to speak to a supervisor on multiple occasions to try and get get past all this BS.
Did you check your DHCP lease details?
Also note that the Ambit modem event log can be rather confusing since it's not in date order.
I was lucky though in that the Sync LED on my modem decided to fail completely and so they had to come out and swap my modem (replacement was the same Ambit 200 model). Since then I've had no further trouble - but it is early days ...