haven't had that happen w/ mine. Yet my H4 seemed to favor turning to one side vs the other ...I had to take apart my steering turnbuckles and servo arms and go back to the manual and resent everything to stock ...that seemed to fix my issue. I am guessing I had tweaked my car too much and made too many setting adjustments that got it out of whack.
Can you go back to stock, re-check all your settings per the manual and kind of start over (if there is nothing obvious of course or you keep racking your brain over it).
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Thinking I may convert my H4 to USGT soon as I'd like to change my 17.5 to something more modern like a TC7 or Xray. ...I have about 3 or 4 seasons on my H4 running 17.5 ...