My gas dryer starts normal but then the flame stops and it cycles trying to relight it

Try YouTube dryer repair instructions. Here is a link to get started:
https://www.youtube.com/results?search_query=WGD9200SQ0+gas+dryer+lights+up+in+beginning+for+about+2+minutes+then+flame+goes+out

replace the 2 solenoid (gas coils) there are out very common

This is usually the dryer coils have failed. They tend to fail as they heat up. They are inexpensive and easy to replace. Here is a video on replacing the dryer coils.

change coils on gas valve

run dryer for 10 minutes then remove vent hose see if start working mean flame on for while, if it is then you need to clean your vent system.

check your dryer vent for a clog let me know what you find

replace the coils atop the burner assy itself, part number 279834..

I had a problem once with a gas dryer that would come on, the pilot would glow and the flame would run on a shortend cycle. The coil that opens the gas valve had a short circuit that would only short out when it heated up. It would drive me crazy since it appeared to be working. The short cycle time the first time, and then maybe not at all once it was warm gave me mixed signals.

Is this the scenario? It lights for a few cycles or maybe not at all. The ignitor glows and goes out but no flame. Comes back on then does the same thing. If so it could be failing coils (those two black cylinders on top of the gas valve assembly). There's a kit that includes both and it's a fairly simple job.

lots of people point the finger at the dryer when they have a problem you could have bad thermal cutoffs on the back of the flame tube BUT is your washer spinning properly to remove the majorityof water from the clothes