Mail lost from Outlook Inbox

I have noticed more and more recently that my inbox will randomly clean itself out automatically. This morning, for instance, every e-mail I had saved in my Inbox (roughly 10-15) so that I could look at them at a later date (such as shipping information on items I ordered online, online coupons and gift cards, etc.) had been cleared from the Inbox, which is now completely empty - and I know without a doubt that I did not delete these e-mails myself. This is not the first time this has happened to me either.

I have checked my "deleted" folder and have even preformed a recovery of deleted messages several times. However, because the e-mails in my Inbox were never deleted in the first place, they do not show up in the "deleted" folder after the recovery. This has happened to me several times now, and each time it causes me to lose MANY important e-mails. 

So I guess my question is whether or not it is even possible to somehow recover these lost e-mails from my Inbox that Outlook is automatically clearing without my consent?