I bought a can of compressed air and blew it out. That made a very significant difference. I noticed an icon advising me my battery needed replacement so I replaced it. That completely resolved the problem. Thanks for your advice!
I have a Toshiba Satellite L655. Had it for years and have enjoyed trouble free operation. Recently it has started running very hot. I have cleaned it and do not see any obvious problems. Any ideas of possible cause(s) would be appreciated.