any contact with water? if so could have got into either the servo or the reciever,
not got a b4.1 but have got an sc10 and i had a similar issue where the steering was fine for a couple of races then started to need constant trimming and eventually was knocked onto full lock, this was caused by a loose servo mount sometimes the servo horn could have come loose too,
are all the settings on the transmitter correct?
if you do have problems with the servo or reciever you should be able to send them back either through the shop or by yourself if its a fault that hasnt been caused by incorrect use,
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