I guess you can't, Ron.
I reckon you're filling the thing up too much and crashing it around the place.
Mine gets some stick mind, and I've had to do a repair after I dropped it and put a tiny crack in the bottom; then tried to 'melt' it over with a red-hot knife; only making the crack into a hole!
There's loads of stuff out there to fix plastics; I'm sure no matter how bad the hole, you could fix it.