Check your fuel pressure at the fuel rail. Could be a failing fuel pump...

Car runs fine for a bit then stalls out. Will restart after about 10 minutes then stalls again further down the road. Getting code P1133 O2 Sensor Heating Circuit Bank 1 + 2 - Sensor1 Electrical Malfunction. Had a similar issue about 6 months ago and replaced the fuel pump relay and it drove fine f...

If you are buying aftermarket relays, for example made by KAE, that would definitely be a known issue. I wouldn't expect it to be as bad as three failures in 14 months but would still believe it. If so, time to shell out for a Volvo relay. Even a junkyard relay is better than a new KAE one, in my ex...

Test current draw on the fuel pump.

Failure mode of the relays would also indicate failure root cause