Wired connection
Windows PC, FFXIV is allowed on Windows Firewall as well as on the AV (WIndows Defender in this instance)
ISP is Google Fiber
Region = United States, Georgia
No error messages
Happens all the time

Will also note I alsohave this happen on a separate laptop while traveling:
Wireless Connection
Same Firewall/AV settings
ISP = AT&T
Location: Massachusetts, United States
No error messages
same character (only play the one)

after some test dummy... testing this happens on all abilities with a cooldown, normal GCDs seem to fire off just fine. Tried with DRG and WAR.
For clarification the laptop above was while I was traveling the first device is my main device but I still have the issue with both on two seperate ISPs and while in very different regions.