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Don't know if this helps, but I was struck with the 'blue screen of death' and random reboots and kernel panics that a lot of T-Mobile iPhone users were seeing.

When I took my 6 plus into the Genius Bar, the genius told me that he could do a 'special wipe' that they could only do in store that would completely wipe and restore the firmware.

So far, so good! No reboots, phone is not running super hot- everything is good. I had tried reinstalling iOS 8.3 via iTunes to no avail.
 
Uninstall all of them one by one. My device made a second resprung just after uninstalling minuum keyboard. And I think there may be keyboard Api issue causing that
Deleted Minuum and did not get a respring. Will post again if it happens.
 
I haven't had a respring for a few days when previously for approx a month I had one or two every single day. This would be whilst using Safari, the Notes app or Messages app etc. No pattern and mainly stock apps.
I have no third party keyboards installed.
A few days ago several apps updated and, coincidentally or not, I have had no resprings since. It could possibly be which apps we have installed, and which are incompatible on some level with 8.3/8.4. Even if we aren't using them at the time of the respring they could be causing some kind of software issue. I don't know, it just seems strange that my daily springboard crashes have disappeared.
 
Don't know if this helps, but I was struck with the 'blue screen of death' and random reboots and kernel panics that a lot of T-Mobile iPhone users were seeing.

When I took my 6 plus into the Genius Bar, the genius told me that he could do a 'special wipe' that they could only do in store that would completely wipe and restore the firmware.

So far, so good! No reboots, phone is not running super hot- everything is good. I had tried reinstalling iOS 8.3 via iTunes to no avail.
Would this be a "DFU restore" Direct Firmware Update?
 
I had an insane amount of these on 8.3 (several per day). Since 8.4 I've only had a couple. Still annoying but much better. I do have some third party keyboard apps installed. The next time I have one, I may delete those. I don't use them much anyway.
 
i think swarm or 3rd party keyboards are the most suspicious ones. try uninstalling them one by one, and you'll see a springboard crash will occur at the same time.
Uninstalled the Crimson keyboard from the usage settings. Low and behold, a respring just happened right after uninstalling.
 
I had a handful of these on 8.3. 8.4 was very smooth with just one every few days until this morning when I had ten during a 90 minute walk. It seems it'd crash when I unlocked the screen while playing a podcast. The only other apps running were in the background (a pedometer and MapMyHike+). Eventually I disabled the Autolock function as a quick fix.
 
I had a handful of these on 8.3. 8.4 was very smooth with just one every few days until this morning when I had ten during a 90 minute walk. It seems it'd crash when I unlocked the screen while playing a podcast. The only other apps running were in the background (a pedometer and MapMyHike+). Eventually I disabled the Autolock function as a quick fix.

is your restrictions active? and have you got any 3rd party keyboard installed?
 
Just had respring. 8.4. No keyboards, no restrictions, no Swarm. Happened right after I downloaded an app.
 
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