Rowland Concentra mk1 - Leaving it on?

I have had this babe for over 4 yrs now, boxed for a long time, got my new place and now its in my secondary system.

First time I beleive I left it on 3 days straight (after using it for over 9 months straight)....its HOT! like fairly hot, even the faceplate warm to hot. Normal? should I power it down while not in use.

And yesterday was the scare. the volume control stoped working for like 1 minute when you physically turn the knob up. the remote volume works fine since I trust thats the microprocessor doing its job. then it just came back to normal. Just curious if this could have happened since it got hot maybe? any advise?thx