No matter where I am riding if I try to take both hands off for more that a second or two - the bike promtly swerves left. Is it me of the bike? How can I isolate the problem?

I had the same problem when my bike was new. I eventually noticed it swerved toward the same side. I checked that I was sitting square and centered over the pedals. When I was convinced that was fine, I began checking the wheel alignment and then found one of the wheels was misaligned. This I checked with a carpenter's level to find when one wheel was perfectly plumb, the other wasn't and was offset to one side by about 3mm. Fixed the problem by filing (very, very carefully) the dropouts with a rat tail file. I've since concluded the fork has a bit too much offset and the fix for that is a new fork, eventually but no hurry.

I'd start by looking at wheel alignment and the possibility of a bent frame or fork

It could be wheels out of dish, a bent frame, a bent fork, or bent saddle rails, or some combination of these. Wheels are easiest to check - remove the wheel from the bike, flip it around and re-install - the wheel should be in exactly the same place WRT the frame or fork. The position of the wheel can also be indicative of frame or fork misalignment - if the wheel isn't easily centred between the seat stays and the chainstays, or between the fork legs, and you know the wheel to be true and properly dished, then there is something amiss with the frame or fork.

OP Here: Got it, I can ride hands free and thank you. Rear wheel off a bunch. Took me a couple of days to figure out how to DIY alignment check. Tied string to front wheel spoke - wrapped around tire and threaded THRU spokes front and rear so as not to touch any. Rear wheel tread wear results were obvious, I just assumed tire wear due to it being drive wheel and carrying extra weight. Bet I just added 2 mph to daily rides. Thanks again.