iOS 9 Public Beta: Diagnostic & Usage Data not being cleared

Normally, syncing an iPhone to iTunes should clear on-device diagnostic and usage data.

However, I'm currently running the latest iOS 9 Public Beta, and diagnostic and usage data is not being cleared (my on-device logs now date back to 07/31/2015). Now it takes a horribly long time just to sync my iPhone because most of the syncing time is wasted on "copying diagnostic information", which is really annoying.

All of the on-device logs takes one the following two forms:

awdd-yyyy-mm-dd-xxxxxx-int.consolidated.metriclog[.anon]
log-sessions-yyyy-mm-dd-xxxxxx.session

I've also tried to clear crash reports from Xcode, to no avail.

Is there any way to force a flush without resetting the phone?

P.S. As I mentioned above, my on-device logs date back to 07/31/2015, which happens to be the day I got my Apple Watch. Is this, by any chance, related to the watch? (I read the logs but can't seem to find info about the watch, so I assume not. Anyway, it's still worth pointing out.)

Solution 1:

There's a program called phone clean by imobie. You only need the free version. Use quick clean on it and it'll go through and delete all crash logs and diagnostic logs from your phone. I use this method all the time to free up a lot of space. https://www.imobie.com/phoneclean/