hello friends
I have 3 Mikrotik Routerboard and using 6.1 RoS .
on RB1100AHx2 Connected users with PPPoE , for random users connect without running and can't access to network .
I have a RB1000 on ROS 6.1 without this problem :
See Attached image :

Hello we have the same problems with many Routerboards RB1200 & RB1100AH
I testing all Boards with many Firmwares i get the fail after some working time. All Boards habe new Routerboad Firmware and new ROS 6.1

All Routerboards are connected to DLINK DSL-321b Modem. Tests with other DSL Modems got the same error after some working time.
to get a working system i make a downgrade to 5.24 and then go to firmware 6.1 but this works not on all Routerboards.

do you have found any other solution.

Contact support, they will look into it.

I still have the same problem on CCR.
You can look at here: http://forum.mikrotik.com/viewtopic.php?f=2&t=73591
Now we are testing with support one of CCR - 10 days of uptime and don't have problem yet.
Contact support, they will help you.

I have one RB1000 and one RB1100AHx2 , on RB1100AHx2 give this problem .
to fix the problem I downgrade the firmware to ROS 5.25 .

Same here witch ccr1036 and 6.1, only dynamic not running, no route created,solves only when restart

same problem here, but in a x86 PC with lvl 5 license! please fix

on ROS 6.2 still have problem .