When literally only his engines are blowing.... something is very very strange with that. The team would highlight any changes in mode he's making that he shouldn't, that obviously isn't an issue.
I would say, there is someone in his side of the garage that is completely incompetent and doing something completely dumb he doesn't realise is wrong because frankly it's the most likely explanation. His engines blowing up at a rate twice as much as the next bad Merc car would be bad, but possible, but like 800% more failures than any other Merc team is.... something absolutely suspicious.
Suspicious doesn't have to be malicious, but there is certainly something going on.