Gmail messages there one day, gone the next

[Joe 90]

Has anybody ever had any trouble with their Gmail showing as 'no emails to see here sir'?

Yesterday morning I got to work any I didn't have anything in my account. However the footer still said I was using 10% of my storage, so 1.5gb of emails are there, but I can't see them I guess.

Also I noticed last night a filter was there with no search term, and a 'skip inbox, delete' action on it. Not sure if thats a failed filter I setup (busy at work so can't remember exactly when things happen at the mo!!) because it was only sending emails I got yesterday to the bin until I deleted it!
But I don't think its anything malicious because the account access logs you can see are only showing my home IP & my ipad/phone.

I've filed a 'where are all my emails' report with google, but they're about as hard to get in contact with as HMRC are!