Thanks for the reply.
Yes, I suspect it was a silly post of mine and that the battery is going. Although I would have expected a bit more than 8-10 hours life which is probably all it’s had. It starts off fine, then after 5 mins starts distorting which indicates the battery to me. It’s always unplugged from both input and amp when not in use.
I’ll get a power lead for it.
Cheers
Phil