fix the problem by isolate broadcast storm
I have got the same issue and I found many threads talking about disable this, disable that,
none of them correct fix the issue in my case,
because this is one of the search result in first page of google,
so I gonna hijack this thread, post my way to fix the issue in my case here,
my cellphone is Sony Xperia V,
Stock 4.1.2 kernel,
build 9.1.A.0.492,
AP Asus RT-N66U
I have tried many things to figure this out,
factory reset,
disable Chrome tilt,
gtalk connect issue,
put suspicious built-in fancy app into disable,
and many many other thing,
after a really long try-error play, about 4 days,
I found BetterBatteryStats always show heavy usage about suspend_backupoff under wifi,
so I put wifi off, let it connect to 3G network, nothing, suspend_backupoff won't show up,
do I get same issue like samsung have a buggy wifi driver in one of the firmware?
it doesn't looks like so because no one else complain about this on Xperia V,
in the mean time I just tried JuiceDefender to put wifi off in 15 mins schedule just to save some battery,
but JD told me that "Data traffic detected, delaying disable",
oops, what the heck? is there some background transfer in my setup?
that shouldn't happened because most of my app has been get rid out,
then I open up SystemPanel, take a peek about real-time network usage,
found out there are about 60Kbps/s data flood into my phone,
installed NetStat and it doesn't show up any running connection that consumed that much data,
I clean up my home lan setup, left only my phone connect to internet,
then everything is normal, no extreme suspend_backupoff show up under wifi,
well, looks like one of my family computer got a program storming everyone else on lan,
after isolated that computer my problem is gone,
so suspend_backupoff can be triggered if you got excessive network broadcast or similar traffic toward your phone,
this's my case, hope it help someone else.