VS2019 throws exception and code gets mangled

Question

Every once in a while, randomly (but when i'm closing in on a deadline) an error message pops up in VS2019 that offers me the opportunity to open a log file. I haven't opened it so I don't know what the problem is yet, but after it happens my code is completely mangled and there's other stuff inserted like this

/* END EXTERNAL SOURCE /
/ BEGIN EXTERNAL SOURCE /
function name17() {
function() { location.href = 'RentForecast'; }
}
/ END EXTERNAL SOURCE /
/ BEGIN EXTERNAL SOURCE /
function name18() {
function() { location.href = 'TaxForecast'; }
}
/ END EXTERNAL SOURCE /
/ BEGIN EXTERNAL SOURCE /
function name19() {
function() { location.href = 'Review'; }
}
/ END EXTERNAL SOURCE /
/ BEGIN EXTERNAL SOURCE /
function name20() {
function() { location.href = 'FinalReview'; }
}
/ END EXTERNAL SOURCE /
/ BEGIN EXTERNAL SOURCE */

can anyone explain why this is happening and how to solve it>

Many thanks in advance and beyond!