Sous Vide Bags bursting

So I keep trying to slow cook things with the sous vide but 70% of the time no matter how high or low the temp, the bags will burst open and I’ll come back to boiled grey beef cause all the juice is gone. Ruined 100’s of dollars of meat so far. This happens after 1.5 hours it seems,

I have the “Food saver” rolls and bags from Samsclub, I have a pretty cheap vacuum sealer, but it was one that was recommended by chef that said it’s the best cheap option he’s used.

And it is airtight. I don’t know whether my problem is the bags, or sealer, or user error. Can someone please recommend bags you can find at a popular store, or on Amazon.

As well as a food sealer, preferably on the cheap or somewhat reasonable side of pricing

THANK YOUUU!!!