Thanks - I'll give it a go.

Hmm. The UK support number seems to redirect to Germany and the chap I spoke to didn't have very good English (although it was better than my German)

He recommended that I hold in in one hand and hit it several times with the other, and to try it both with the Karma turned on and with it turned off.

Sounds a bit Heath Robinson to me - does it actually work, and if so does it do any damage? If it fixes the problem, will it just fix it long enough for my 90 days to be up and then totally fail?