They're most likely trying to make/enlarge their wallow (with it being warmer they need them more, so if you fill a good big hole for them they might stop misbehaving
)
I use tyre bowl drinkers which work better than anything else I've tried - they're not so easy to tip, have a good rim to let little 'uns drink easily and they're light and easy to lift for rinsing and cleaning out.
You can get them online from 'Supplier for Smallholders' but some agri/equine places sell them too - the last ones we bought were around £12, but that was almost 4 years ago so they might have gone up in price since (the ones we bought then are still more than serviceable even after daily use - they withstand serious frosts/bright sun/full grown sows and boars without any issues)
They're fab, we've never had one broken yet
(and no, I'm not on commission
)