Recrudescence (noun) = the return of something terrible after a time of reprieve

The word "recrudescence" comes from the Latin "recrudescere," which means to become raw again or to reopen (as a wound). The term was originally used in a medical sense, referring to the reappearance of a disease or wound, but later expanded to describe any revival of an undesirable situation.

"After months of peace, Bob’s diet suffered a recrudescence of bad habits when he discovered a forgotten stash of Halloween candy in his desk drawer. What started as just one tiny Snickers quickly spiraled into a full-scale sugar-fueled binge, culminating in him dramatically vowing—once again—to start fresh on Monday." --Chat GPT