philips 37pf9975/12

[jj]

Ihave been given this plasma by a customer who has replaced it with an l.c.d.the set works fine for up to 2 hrs after which it will go off.after about 5 mins it will come back on with a very washed out picture,the stand by led will flash green/orange once followed by eight flashes.there seems to be alot of relay clicks going on even when its working ok none of which seem to effect the raster.has any body got experience with this set[ftp2.2 chassis] many thanks