Yeah similar to what dunny said really, I started off with a Netgear router and has similar problems but Karoo wouldn't help because I wasn't using their supplied router...

So I changed over to the Karoo supplied router (Thompson TG585) and still had connection issues but typically Karoo blamed everything but their own equipment...

Now I've changed to Airnet and happy days are here again...

I think your best starting of calling the Karoo help desk in the first instance, you can always slit your wrists afterwards..

Good luck..