I have noticed that sometimes in VATS mode when I try to fire my weapon, instead of firing, my character will use a stimpak and VATS will be cut off. Why does this occur and what can I do to control it?
Based on posts I'm finding, like this one:
Has anyone ever tried to attack in VATS and instead your character stabs himself with a Stimpack? This has happened to me several times, and today my character did it three times in a row until I gave up and manually shot the ghouls that were swarming me.
or this one:
Hi all just wondering if anyone else is getting a glitch when entering executing a VAT and the character decides they need a stimpak more than killing the enemy. This started happening after I found the Deliverer and used it for the first time. I'll enter VAT and pick the locations but as soon as I try and execute my player will use a stimpak and then exit VAT... Been happening more and more, and the weird thing is that it doesn't use up any of my stimpaks in my inventory.
or this one:
Anybody have a problem with your character occasionally randomly using stimpaks in VATS?
I unfavorited them but it still happens sometimes
It seems like this is just a very frustrating combat glitch, however, it doesn't seem to be listed on this list of Fallout 4 bugs.
A possible fix is mentioned in the description of this video, which states:
Switching in and out of 3rd person seemed to fix it, as you see at the end.