I moved my 655 back to firmware 1.21 (Hw rev A3) to get it stable.
I don't need to do reboots after that.

Also, decide why you do encryption, I prefer locking down on MAC addresses.
Then noone can use my network, but if they want to scan where I'm surfing, don't really care. But I don't live in a flat down town.

I have a 9400, and will do some tests.