Try swapping wheels left to right.
The Mini uses VDO or Huf valve mounted sensors. The signals are already weak due to restrictions to stop them microwaving people through their foil hats or blocking Channel 5, so a low battery and anything extra between sensor and receiver is enough to cause a loss of signal. Its a BMW so the threshold to be invited to the dealers is always low. Get the weakest signal closest to the receiver and you have the best chance.
Once they start to go its all down hill. Signal re-acquisition burns battery and low battery loses the signal.
Any tyre place with a sensor tool should be able to check the batteries, the hand held tool is pretty universal, no need to use the dealers if they are out of their depth.
Andy
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