Every saber wielder is experiencing a problem with losing blocking abilities (save for Maul, obviously).
This has happened very regularly since the release of Dooku.
Most of the time it's happening after being in combat.
The wielder will not be able to block anymore (until respawn) tho the stamina bar still drops as though it is holding a block.
I've opened a report full of details and analysis about the BUG you're mentioning here. It can be found with this link: https://answers.ea.com/t5/Bug-Reports/Disabled-Block-BUG/m-p/6762835
This report here was created on April, and the creator never came back to check its progress. A default response from EA was flagged as a Solution, when clearly it isn't a solution at all. And if you check the details about the report, you'll see the creator clearly mixed up several things at once, BUGs & features alike.
So I recommend we leave this report dead, it doesn't help anyone, it only increases the mess. I'll point out some details to show how messy this report is:
He first complains about blocking not working, which is fine, but then he says enemies can stun him while blocking, which is an intended feature of some stun effects (while others can be blocked). Then he says it can even lead to instakills, which is clearly an exaggeration from him, or a completely different and unrelated issue.
Then when explaining how to trigger it, he uses Rey as an example, and says her normal attack can go through block, which isn't true, and never was in any moment throughout the history of this game. He probably messed up by calling her ability 'Dash Strike' a normal attack, as her Dash Strike was unblockable until a few Patch Updates ago by DICE's Design. And he finishes by falsely accusing Rey of being immune to any inability to block. In my report only, Rey loses her block several times.
