You could also help Mikrotik by mailing Mikrotik support about this problem.I have been tracking down a few reports within our network due to 1-2% packet loss.
Isolated the issue to only RB3011UiAS devices. After finding this thread, I disabled the LCD on one unit, and it immediately resolved the packet loss issue. Disabled LCD on 15 or so other units, also resolved the issue.
Running 6.42.3 on all of the affected devices. We will be deploying a mass update to our network disabling the LCD on all RB3011s.
In our network, it is now considered a KNOWN bug. I hope this helps others!