Hi there,
One possible cause of this is there is a known fault with the DMR-E55 where it goes into self check with intermitent shut down, so much so there is a mod kit available to try to overcome this. The kit costs around £20 online. However the kit composes of componants that need to be soldered into place and I stress this should only be under taken by trained technicians as further damage could occur, also the removal of the cover exposes potentially live electrical parts. The cooling fan could also indicate that there is a problem on the circuit board or the fan is on it's way out and needs replacing. My only recomendation is to take it to a Panasonic registered repair centre.
Hope this helps,
James
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