Being stunned twice with 1 bash
 

It looks like i'm getting stunned twice back to back with 1 bash. The messages are like this:

You are stunned!
Rogue clockwork bashes YOU for 6 points of damage.
You are unstunned.
You are stunned!
Rogue clockwork bits YOU for 2 points of damage.
You are unstunned.

It might only be stunning twice if you're attempting to turn while you're stunned, I"m not 100% sure.

I have noticed this as well. Seems like you get stunned for a few seconds, briefly become unstunned, then stunned again another second or two.

If you are button mashing, you get the "You can't attack while stunned!"(I like to mash me some flying kick)

Pulled a few entries from my logs from today.

[Thu Jun 11 02:23:45 2015] You are stunned!
[Thu Jun 11 02:23:45 2015] Guard Colin bashes YOU for 12 points of damage.
[Thu Jun 11 02:23:45 2015] You can't attack while stunned!
[Thu Jun 11 02:23:45 2015] You can't attack while stunned!
[Thu Jun 11 02:23:45 2015] You can't attack while stunned!
[Thu Jun 11 02:23:45 2015] You can't attack while stunned!
[Thu Jun 11 02:23:46 2015] You can't attack while stunned!
[Thu Jun 11 02:23:46 2015] You can't attack while stunned!
[Thu Jun 11 02:23:46 2015] You can't attack while stunned!
[Thu Jun 11 02:23:46 2015] You can't attack while stunned!
[Thu Jun 11 02:23:46 2015] You can't attack while stunned!
[Thu Jun 11 02:23:46 2015] You can't attack while stunned!
[Thu Jun 11 02:23:46 2015] You can't attack while stunned!
[Thu Jun 11 02:23:46 2015] You can't attack while stunned!
[Thu Jun 11 02:23:46 2015] You can't attack while stunned!
[Thu Jun 11 02:23:46 2015] You can't attack while stunned!
[Thu Jun 11 02:23:47 2015] You crush Guard Colin for 37 points of damage.
[Thu Jun 11 02:23:47 2015] You crush Guard Colin for 8 points of damage.
[Thu Jun 11 02:23:47 2015] You crush Guard Colin for 29 points of damage.
[Thu Jun 11 02:23:47 2015] You are unstunned.
[Thu Jun 11 02:23:48 2015] Guard Colin slashes YOU for 43 points of damage.

[Thu Jun 11 11:40:03 2015] You are stunned!
[Thu Jun 11 11:40:03 2015] Guard Colin bashes YOU for 18 points of damage.
[Thu Jun 11 11:40:03 2015] You can't attack while stunned!
[Thu Jun 11 11:40:03 2015] You can't attack while stunned!
[Thu Jun 11 11:40:03 2015] You can't attack while stunned!
[Thu Jun 11 11:40:03 2015] You can't attack while stunned!
[Thu Jun 11 11:40:03 2015] Guard Colin hits YOU for 39 points of damage.
[Thu Jun 11 11:40:03 2015] You can't attack while stunned!
[Thu Jun 11 11:40:03 2015] You can't attack while stunned!
[Thu Jun 11 11:40:03 2015] You can't attack while stunned!
[Thu Jun 11 11:40:03 2015] You can't attack while stunned!
[Thu Jun 11 11:40:03 2015] You can't attack while stunned!
[Thu Jun 11 11:40:03 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:04 2015] You can't attack while stunned!
[Thu Jun 11 11:40:05 2015] You crush Guard Colin for 14 points of damage.
[Thu Jun 11 11:40:05 2015] You crush Guard Colin for 37 points of damage.
[Thu Jun 11 11:40:05 2015] You can't attack while stunned!
[Thu Jun 11 11:40:05 2015] You are unstunned.

noticed this as well

tried pulling 6 mobs at once today and was chain stunned for 20 seconds straight until i was dead just from bashes

Yep, noticed this same thing last night while fighting mobs in Befallen.

Is this new issue after latest patch?

Appears to be. I didn't experience it pre patch.

Can't find any instances of it in my log prior to the patch.

yes, this was certainly not happening before

I got double stunned after casting Harvest today on a 51 Wizard. Sorry I don't have logs to provide.