Hello @Smm1990, welcome to the community!
It’s unfortunate that you’ve lost the contents of your containers, could you please share a screenshot of how and where they were exactly placed to help our team reproduce the issue and address it?
Did it happen while playing online in an official server?
Can you also let us know through the information displayed in the Event Log if they lost stability after the daily server restart, or upon you logging in?
It might be advisable not to stack containers on top of placeables other than building blocks, such as ceilings or foundations, in order to prevent any possible loss of said containers due to stability related issues.