Yes, i think so too.

I am also under the impression it happens to many people without them being aware of it. Many have the mentality; "It works for me so you're doing something wrong." without really understanding the issue.

I have the exact same "problem" i decided to just ignore it as overall its 2-3ghs loss;

I posted about this in several places and got a few replies but nothing helpful. I can sum it up to people posting the same 101 troubleshooting suggestions and a handful of others saying they have the same problem.

It still happen once or twice a day. Its the top blade if you look at it in the webserver in miner status.

It look like a sharp dip in the pool's graph everytime;


Typically only last 2-3 minutes.

Edit: My S5 is batch 7 (used from bitmain) on the latest PCB.

Use this Firmware


https://bitmaintech.com/files/download/SD-S5-20150715-fan_ctrl.tar.gz

I think this must be a tad exaggerated. Just the chances of 22 miners having same problems are slim.   Did the same person setup all of these miners?

I read the PSU's do you have any that are a little bit higher quality?  Those are all ok... none great.  But I suggest posting some networking screens, status screen, etc.   I think 22 miners something chances are something was set wrong.

okay lets start right here.

you have s5's correct?

every psu you use is a bare minimum psu.  they all should be able to supply enough power yet they act like they don't.

So first question is on each psu do you :

 use 4 cables from the one psu into 1 s-5  or do you use 2 cables from 1 psu into 1 s-5?

Next question is the gear in different locations with different internet.  Or all in the same location?

Next question do you mine on the same pools or different pools?

Sounds extremely unlikely. How do you know that the left board turns off for 6 minutes?

Rich

Obviously, this is boards problem.
They are sometime overheated and now we have some chips with poor contact.

My recommendation. Turn the controller to the other side, so that data cables can be exchanged. It is only four screws, at Controller metal frame.
Check , the error is repeated on the same blades or not.

Try switching the power plugs into the hashing boards, and see what happens. If the problem moves, then the issue is the power supply.

this happens with mine as well..
its usually just one hash board and its down long enough to cool it off.

the 8 port switch may prioritize its ports and if you get short bandwidth it cuts it to the port for that 1 miner.

Or a shit board on that miner or a bad cat 5 wire.

but the fact that it is always the same board is good.
-------------------------------------------------------------------------------------------------------------------
First test is this
we can narrow this down I hope.

take the cat 5 cable out of the miner that drops its board.

lets call that miner bad-boy

take the cat-5 cable out of the miner that never drops it board lets call it good boy.

 if problem moves to  good-boy miner then > bad switch port/ short band width / bad cable

 and if the problem still occurs in bad-boy   we have eliminated short bandwidth and bad ethernet cable or bad port switch

 
----------------------------------------------------------------------------------------------------------------------------------------
we then test this below

we have narrowed the problem down to
1)bad board
2)bad controller
3)bad cable that connects board to controller.
4) the board is good the cable is good and that port on the controller is bad------------------this is something you can fix

sorry but I meant hard wired or wireless.

 you have hard wired and pretty slow one.  do you run other gear on that internet connection?

if you watch a 1080p or a 720p video on the net connection of 2mbps while mining you may drop out  a miner. 

wifi connects can have issues. not your case


 a slow switch can drop 1 board..




so modem(2mbps) to (switch) how many ports?  and are the ports 10 or 100 or 1000 speed.





if you are modem>>>(cat 5 wire)>>>8 port switch>>>> s-5's and a pc  it may work better then

modem
 1)one port direct to pc
2) one port to switch
3)switch to 5 or so s-5's

in the case of pc not on shared switch watching a movie could take too much bandwidth from the switche's ports

what is your internet connection?

Sounds like your net connection is dropping out.  (since the psu's you use should be good)

Also did you  over clock or  use standard clock.

Did you at any point notice random beeping even though the temperature is way below 80C?