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.

 

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