I think I got the problem solved. Thanks for leads.
Last time used the saw, I gave the chain a put-away lube of WD40. The chain lube is gunked-up with wood stuff and not lubricating chain adequately. The air intake and filter are clogged.
What I think happened: WD40 gummed up links and bar guide, so when the chain warmed up, the chain loosened. A readjustment of the chain caused the chain to tighten when the bar and links cooled during the time I readjusted. So now I have a tightening chain on the next start. It very quickly starts to bind and because the air intake is clogged, the engine has no power and quickly dies from air starvation and a overly tight chain. I loosen the chain up which allow the engine to run which again heats gummed WD40 to where it starts to bind links and chain guide. Repeat.
Solutions: Reclean-oil chain with WD40, clean lube port and gunk around area. Open up air port and clean air filter. Heat up can of the correct chain lube over gas stove, to get propellent gas moving, so that I can use the lighter lube on the chain. Sharpen cutting teeth file down forward tooth to get bigger chips which have a lower propensidity to clog critical areas.
Of course I won’t use the stove but will need to soak chain in solvent and then use the proper lube .
I have an Echo 14" about 7-10 years old. Before that an Shindawa which lasted 20+ years. Didn’t know they have self tensioners. I was amazed to have the handles isolated with rubber bushings and rubber grips,