FYI, there are no "NFL Experts". The commentators are couch coaches and don't have a clue what is going on on the field.
Watch a replay of the picks. The majority of picks I can think of were receiver faults. Last game, he threw a ball away at a receivers feet to prevent intentional grounding because of pressure from a blown screen setup and the receiver kicks it in the air and gets picked off. Another pick, the receiver stopped on the crossing route over the middle. It would have been a perfect pass, but instead went to a defender. A game or so before, Bortles, according to the "experts", threw into triple coverage. But it wasn't really. The receiver had double coverage beat and Bortles made a perfect throw. But another receiver gave up on his route allowing his defender to break off early and run back and pick off the pass. Other passes hit receivers in the hands and they pop up in the air for the pick.
I am not saying Bortles hasn't made some bad throws. But he is obviously frustrated with his O-line, his RBs who can't do squat or fumble, and especially his receivers.