[USER=”2″]kwatt[/USER], [USER=”4209″]electrofix[/USER], thanks for the replies. We have 2 microwaves (a stand alone Sharp and integrated Hisense) and the new Hisense replaced an older Bosch integrated. The Sharp just doesn’t sweat or at least has minimal condensation after microwaving, and the old Bosch integrated could get a bit heavy on the condensation but only if a hot dish was left inside standing, but no way as much as the Hisense does which will happen just after a few minutes of microwaving.
It maybe a a sign of good insulation compared to the other two, but I can’t see how this cannot have an adverse effect on the internal structure/wiring.
As mentioned, I have contacted Hisense and am waiting for their response. It’s still under warranty, so if it is an issue, I should be covered. 🙂