Cheers Awa - good to know peeps are getting informed from this.
Have actually Posted a reply in another post due to some discoveries I have recently made
Post Is:
http://forum.mikrotik.com/t/32mb-ram-devices-and-ros-6/81580/1
Have actually discovered that it appears to be an issue in RoS v6 ‘vs’ Routeros HW that has 32mb ram or less (to my regular PC hardware troubleshooting Skills anyway - I know it’s different - but not totally).
I am seeing units that have a Lower RAM amount tend to struggle with the HS Clients - each one coming through slower and slower - until it finally just reboots from watchdog.
This was tested - and currently still proving in 2 x rb751U’s - 1 has 64mb - stable for months - one has 32mb - Different location - Similar foot traffic - same config (well apart from name strings - for 2 library’s - free Wifi) - 32mb falls over up to 5 times a day - have had a couple of good 4-5 day runs though - but not often.
Units with higher RAM seem to handle this a lot better. It’s Just a Fact.
So recommendations from my non official background - Upgrade your HW if you are required to upgrade to RoS 6 (RB951U is cheaper than RB751U was when I originally posted - and has 128mb, and 600MHz - has served me well) - if security is handled elsewhere - then your router probably isn’t doing much anywho - so RoS 5 is good… however for everything, I am a technician - therefore recommend the upgrade to the latest features/security.