Is anyone else using their E90 to connect a laptop to the internet?

I do this all the time and on my previous phone, an N93, this worked (nearly) flawlessly. (Pretty much the only thing that did work flawlessly on that hellhole of a phone.)

But on my new E90 it's terribly unreliable. After connecting it will work for a bit, but after a few minutes, no data will flow. The phone remains connected, but connections on the laptop time out. If you just leave it alone for another few minutes, then it starts working again, connections can be made, for no apparent reason. And the cycle continues. This makes connecting to the internet through the E90 almost entirely useless.

Oddly, I have recently discovered that if you force the phone to use GSM only and not 3G, the problem doesn't seem to happen.

Any ideas?

After a few more days of testing I can confirm that this is definitely a problem, but only when connected by 3G. GSM works just fine, though obviously slowly, but on UMTS there are periods when it works fine and periods when data simply does not flow, which usually results in most of your connections timing out.

This seems like really quite a major flaw, and I am open to workarounds or any news that Nokia might be fixing it soon!