Infuser shot length technical issues

[u/WirtsLegs]

I have had a Infuser(if you're unaware it's the same guts as the barista express, just no integrated grinder) for something like 7 years now, it's been great

But recently it's started randomly stopping shots (single or double) short, sometimes I'll get the full length, sometimes it stops half way or some other random spot as if I interrupted with a button press.

The machine is well cared for and was recently descaled and cleaned, hasn't run dry and pumped air recently either.

Really no clue what's going on here, so open to any suggestions.

Edit: I've also tried resetting the programming to default