TPMS troubleshoot

My TPMS is working intermittingly. All of the tire sensors were replaced about 18 months ago and are all working. Scanning with a Leonardo clone shows them all reporting accurate pressure.

Almost every time i start the car, i get a low pressure warning. I go through the reset and sometimes it clears and sometimes not. Then on occasion, iI get a tire puncture warning.

Is there a weak link it the system that is a common problem other than the pressure sending units in the wheels? Does the receiver go out? Any inexpensive fix or replacement? Ricambi lists the ECU as unavailable. Any other non-Ferrari use the same part?

 

The ecu is also used in the Maserati QP of the same era. Hoping its also used on something less exotic.

 

Its a Beru TPMS system; looking at photos from other cars, the same system seems to have been used extensively in VAG group cars.

The part number (221360) is shown as being used in Maserati Granturisomo as well as Quattroporte. One here for ~$100 used:

https://www.ebay.co.uk/itm/Maserati-Quattroporte-M139-2006-Tire-Pressure-Monitoring-Unit-ECU-200811-J127/143532466775?hash=item216b33a257:g:C4QAAOSwSlVeRmL-

 

Of course I went on a 250 mile drive on Friday and everything worked perfectly.