I used to have this problem.... but the problem disappeared when go to TC.
However, I think it is quite common, according the the SE.
what they will do is to
1 reset the sensor and then you drive off and see how.
2 if still got the problem after a few reset, they can then change it.
they can't change it straight away as they need to try to reset it first.
don;t need to book an appt, just call TC, ask to speak to any SE (by name if you know them) then ask them what to do.
finally, I got mine changed...