Alt key "sticking"

ISP:
AT&T

Type of Internet Connection:
DSL

Internet Connection Speed:
5Mb/s

Date & Time:
Continuous as of 10/14/2019 and few weeks prior

Frequency:
Sometimes

World:
Siren

Character Name@Home World:
Asmun Shytower@Siren

Retainer Name:
None

NPC Name:
None

Monster Name:
None

Class/Level:
All

Party or Solo:
Any

Race:
Hrothgar

In-Game Time:
Various

Area and Coordinates:
Various

Housing:
None

Steps:
My issue appears to be identical to that described in this other forum thread: http://forum.square-enix.com/ffxiv/t...-key-acting-up

However, as that thread was closed due to suggestion of posting in these forums instead, no actual solution was posted. I tried searching these forums for "alt key" but returned no results. My mouse is a Logitech M500 USB Mouse. As stated in the linked post, when using my mouse's thumb button, rebound to Alt through the use of a third-party program called Mouse Manager, roughly 10% of the times I use that button in an attempt to use an ability bound to Alt+<something>, my computer continues to register the Alt key being pressed until I press the button again. I have unbound all other Alt-hotkeys in the game to somewhat mitigate the problem, but I still frequently find myself in the alt-tab menu and activating alt-hotkeys when I want to use non-alt-hotkeys. I have not been able to discern any sort of pattern as to when the key "sticks" or does not. I have confirmed that Sticky Keys and its keyboard shortcut are both disabled.