I also had that problem, i replaced the Volvo-relai for another Volvo-one because a had a spare.
To notice if it happens again, i placed a second seatbelt-reminder-light in the middleconsole paralel to the glowplugs to "see" them glow.
So i can even notice if they're glowing a while after the engine just starts running, especialy in wintertime.
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