Missing Files and Document

Dear,

Today also same my office data its like vanishing All of them are PDF some are not opening and some are vanishing after some time.

its very urgent i need those file back. this think happening after upgrading box to Business.

Now its starting to remove img every type of file. From the outside it showing there is file but inside no file available if i try to open it vanish or saying the file not there. please try to fix this issu as soon as possible i need my file back its very important

Its showing i have my file but when i enter only 2 file this is just one folder but it is happening in every file