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Dear enrique442,
Hope you're well. Yes! The ignition power stage (IPS; Volvo Part#: 3501921; Bosch Part #: 0 227 100 124) likely is "on the way out". This part is available from: https://www.fcpeuro.com/products?keywords=0%20227%20100%20124 . If your car has the factory-original part (made in Germany), that part doesn't owe you a penny!
The IPS - affixed to the inner fender wall (driver's side, for a non-turbo, about a foot or so from the headlamp [i.e., towards the windshield]) - is "flat", with a gray cap. It is mounted on an aluminum "heat sink", which is secured to the fender wall by two screws.
Between the IPS and its heat sink there should be a heat-conducting grease. That has probably long dried out. The dried-out grease slows heat transfer to the heat sink, which dissipates he heat. So, when the power stage overheats, it "cuts out".
You might try: (a) removing the dried-out heat-conducting grease and replacing with fresh grease; (b) cleaning the contacts on the power state and its connector with an aerosol de-oxidizer (e.g., Deoxit or similar). Sometimes an invisibly-thin layer of corrosion can disrupt the flow of power. So, do not rely on visual inspection to ascertain if a connector is corroded.
Hope this helps.
Yours faithfully,
Spook
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