Back from work now
Here my case but with r30 firmware (but i am sure still apply to the r36)
What i mean with every firmware if find a less congested channel i m sure can get less jitter
Both with 5 channels (as you say which helps of course) but apart that the channels the modem locking it helps more
mate next door(yesterday graphs)
bear in mind he got 4 laptops and few phones plus xbox (maybe that why to high spikes in a small connection
He is on the same cable,cabinet but locked to different down/up channels than me
mine
Now before 3 days got about 6-7 disconnections in sort time,due to T3 errors which cost in return reset to my SH
(is coming an engineer about it)
(dont know if affected mate next door because i set up his monitor day after)
The reset caused to change the bonded channels so each time the SH locked to different one
Note about 5:15 till about 5:45 it locked to one with bigger jitter spikes
I done test via pingtest.net and jitter was 5 (now is all the time 2)
Also note my mate graph same time (even if is different date)
My SH locket to more congested channel as him
So i think that what happens to you
each time the SH get reset it change its values
Just reset it as many times need to find less congested channels
