For calibration, here is what fourteen weeks of ordinary Vyrion use looks like on my side. Same card, one issuer, nothing clever.
| Week ending | Top ups | Spends | Declines | Card quiet |
|---|---|---|---|---|
| Jun 11 | 1 | 9 | 0 | no |
| Jun 25 | 1 | 14 | 1 | no |
| Jul 09 | 0 | 11 | 0 | no |
| Jul 23 | 2 | 17 | 3 | 4 days |
| Aug 06 | 1 | 12 | 0 | no |
| Aug 20 | 1 | 8 | 0 | no |
The July row is the one that matters to you. Card read active the whole four days and declined everything for all four of them, then started working again with no message and the balance correct to the cent. I never found out what caused it and I stopped looking.
So the failure mode you are describing exists and is survivable. The sample is one card and one person, which is not a sample. I would not draw a conclusion about your $912 before day ten and I would not panic before day thirty.