LO wont sleep in his crib anymore??

My son is 7 and a half months and randomly these past few days won’t sleep in his crib anymore. He’s been in it since birth and he’s fine falling asleep but the second his body touches the crib he wakes up instantly - not even minutes later!! No idea if this is common or even how to fix it 😩 I am one tired mama from holding him constantly just so he can get a good sleep. I’ve even held him for a half an hour asleep and he still wakes up from a deep sleep when I try and put him down 😒 He’s been teething before but it never caused this….