2018 Infiniti Q50 — tires or pads first for a beginner autocross season?

Ask what changed right before it started. Capture voltage while the 2018 Infiniti Q50 is actually failing — after it restarts you've lost the clue. Save the big job until that test fails. Keep sale price, fees, and rate as three different conversations. That's coming from doing this as an owner, not a shop. If that fails I'll eat the diagnostic fee.

Intermittent stuff lies if you only catch it once. Get a real battery/charging test on the 2018 Infiniti Q50, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. On “tires or pads first for a beginner,” that was the fork that mattered for me. I'd want that in writing, not as a promise. Checking again after work.

I wouldn't throw parts yet. Write temp, speed, and in-gear vs coast when the 2018 Infiniti Q50 does it — then decide on parts. If the cheap test changes it, stop and reassess. This is from a 2018 Infiniti Q50 in Houston with 156,500 miles. Write the result down so the next test isn't a repeat of the last one. This is the version I'd tell a friend.

OP here — recorded a short video and noted speed, temp, and whether it was in gear. I already checked the easy fluid levels.

If it were in my driveway, write temp, speed, and in-gear vs coast when the 2018 Infiniti Q50 does it — then decide on parts. That's the branch I'd chase this week. I'd want that in writing, not as a promise. Only after sitting overnight so far.