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First guess? Power supply issue. Perhaps not acquiring enough current from the express slot itself? May explain why a resealing is necessary. Why such a complication surfaces occasionally instead of constantly, well, is a curiosity indeed.
RPM spikes of the fan are another & typical indicator of insufficient power supplied to the card. In my experience, though, the computer and/or card itself doesn't boot when demonstrating such behavior as a circumstance of said power insufficiency; for example, I'll forget to attach requisite PCI-E connectors to a GPU in crossfire & the result is a card not present via "device manager" (at least not preceding a reboot). So perhaps I'm barking up the wrong tree in trying to understand what's happening.
There's a bit of anomalous card behavior going on here, though, & I'd initiate troubleshooting protocol by ensuring the PSU is doing it's job. Try the card in another computer, perhaps. Maybe the motherboard isn't diverting enough power through the PCI-E slot itself, for example. Good luck, let us know what turns up.
RPM spikes of the fan are another & typical indicator of insufficient power supplied to the card. In my experience, though, the computer and/or card itself doesn't boot when demonstrating such behavior as a circumstance of said power insufficiency; for example, I'll forget to attach requisite PCI-E connectors to a GPU in crossfire & the result is a card not present via "device manager" (at least not preceding a reboot). So perhaps I'm barking up the wrong tree in trying to understand what's happening.
There's a bit of anomalous card behavior going on here, though, & I'd initiate troubleshooting protocol by ensuring the PSU is doing it's job. Try the card in another computer, perhaps. Maybe the motherboard isn't diverting enough power through the PCI-E slot itself, for example. Good luck, let us know what turns up.