Car Shutters on Deceleration around 37-38 MPH

Got a new issue that I would like to investigate in case something else is starting to happen.

for the last month or so (interment) the car shutters when doing a slight decel around 37-38 MPH.

Some times if it shutters enough the traction control warning light flashes and then goes away

the would be a decel but no braking so a coast but with the inverter charging HV battery from wheels turning. Usally when maybe just around 40 or slightly higher and take foot off gas pedal to start the coast. tonight i drove with the defroster on (with AC) and it seems to do it allot less or at least to the point where it was not a big noticeable shutter.

Was not sure if this was the transmission doing a gear shift or the ICE engine doing something weird.

Car has new Plugs, Injectors, Coils, MAF sensor, Both O2 sensors (having an issue with upstream one after replacement throwing a code for P2238 so I am waiting for another O2 sensor assuming this one was defective) but the Shutter was happening before O2 sensor was replaced

 

Sorry forgot 2006 Prius with 230k +

 

Injectors OE but rebuilt. MAF and coils OE, Spark plugs Iridian but maybe not OE, O2 sensors not OE hence probably why i got a defective one. But why is it mainly at one speed and during mostly a decel? It almost seems like a upshift and engine release at the same time and why would it be better when AC is running?
Forgot to also mention I removed throttle body and cleaned it. some oil in bottom of intake manifold that i mainly coaked up with a rag. Also the some times Traction light flashing? the car runs great other wise.

 

got decent scan tool. not top of line but not cheap junk either only code right now is P2238 I replaced O2 sensors because was getting code P0172