TPMS - Fault

[NJP10]

Hi Guys

I’ve been having the TPMS warning light pop up only on the motorways never on local driving and not always straight away, it always seems to be at half way point of the journey. When I do check the tyre pressure at the service station they seem to be fine maybe 1psi out but that’s probably due to different machines being calibrated I assume. The strange thing is I never seem to get the fault message on the return journey! I always check the pressure before leaving maybe the night before or on the day.