LMB bound skills

im not sure how to explain this

i have arcane cloak bound to LMB so it auto casts while im running around. i've had it like this for months now, since i started playing a specific build which uses it. i've never had any issues with this previously. except now, i am constantly getting my movement canceled where my guy will just stop walking.

he isn't casting, he isn't frozen, he isn't stunned. it happens when i cast as well....im using scorching ray on RMB and how i play is i'll always have LMB pressed down and i'll hold down RMB to cast SR and override my movement until im done casting, i'll let go of RMB and continue to walk since LMB is always active.
however with this stuttery garbage my guy will just stop casting SR at random. again, not frozen, not stunned, nothing like that.

i've tried changing render from dx11 to vulkan and back. i've tried 'always attack without moving' and not. nothing seems to resolve the issue.

i've been playing this build for months and haven't had an issue until yesterday or the day before, but its so annoying because it feels like i cannot control my character. im running along and i just lose control.
its caused me multiple deaths so far.
the only thing that makes my character move again is releasing LMB and pressing it down again, but sometimes he just stops immediately after again.

my guy feels like he doesn't know how to walk. im starting to think that its server lag/issues but there is no indication of any problem in the overlay

is anyone else experiencing such issues? because its extremely annoying given how random it is