Tpms issue
 

My service tire monitor system light goes on and off randomly stating a different tire isn't registering each time. Does anybody have any input on this?

Year and model ?
Original TPMS sensors ?
Are you the original owner ?
Sensor batteries are only good for about 8 years.
Has the car battery ever gone dead or been disconnected or changed ?
Some 2008 models have a program issue after a dead battery. Needs a software update on those.

Are the positions set?

2008 hhr ss
I am the second owner purchased car this past weekend so im unsure about any of the other stuff

Not sure how to do that just got the car last week

Owner Manual link in my sig.

All the tires are set and fine 90% of the time. occasionally on startup it doesn't recognize the left front. Other times its the right front and so on

The batteries last 8-10 years. Let's do maths, 2019-2008=11.

So more then likely all 4 need replacing

I would say so.
When I bought my used HHR only one sensor would drop out, always on the same tire. not knowing the history of the sensors I installed all 4.