Exchange Calendar sync loops, drains, and fails

It seems I have got the same problem as described here. The symptom is that the Exchange sync never seems to finish. The phone runs hot and probably uses a lot of network traffic. The problem is that the disable/enable of Calendar sync trick fails on my iPhone. It tries for a long time and then it times out. I can't even remove the accounts completely, that fails in the same way.
It's an iPhone 5S running iOS 7.0.5. I'm syncing three calendars. Two Exchange accounts from different servers and one Gmail.
This problem happened to me once before and then I ended up doing a Factory Reset. I'd rather not do that again.
Power assertion timeout: https://dl.dropboxusercontent.com/u/26840/iOS_power_assertion_timeout_DataAccess _Exchange_related.png
and with https://dl.dropboxusercontent.com/u/26840/iOS_power_assertion_timeout_fetchMobil eSynchronously.png
MobileCal: https://dl.dropboxusercontent.com/u/26840/iOS_MobileCal_has_active_assertions_be yond_parmitted_time.png
The preferences timeout:
https://dl.dropboxusercontent.com/u/26840/iOS_preferences_timeout_turning_off_ca lendar_sync.png
I would love to find a solution to this! It could be to the root of the problem, how to force calendar sync off, how to force removal of email accounts, or to something that I've missed.
PS. I've asked the same question here. DS.

Not sure if this will help, I found it solved a slightly different problem.  the following is a re-post from a different thread.
I've had similar issues - although my email and contacts were syncing with Exchange without issue, in iOS7 I developed a one-way problem with calendar sync.
Appointments created on my iPhone were syncing fine to my Exchange server, and were then visible in outlook on my PC.
However items created in Outlook were not syncing to the iPhone.
I'm running iOS 7.1 on an iPhone 5; plus Outlook 10 on a Windows 8.1 machine connecting to Exchange on Small Business Server 2003.
I found a solution here.
On the PC, go to your calendar and right-click the Calendar folder.  On the Permissions tab, change the default Permissions from "none" to "Reviewer".  Apply changes.
Then on the iPhone, remove and add back the calendar in Settings.
I have 3 separate calendars on my exchange server and had to do this for each one.  When I only did it for one calendar at first, this was the only one which appeared on the iPhone.  So, it seems to me that this was definitely the culprit.
Interesting that this problem only reared it's head since the iOS7 update.  Calendar was working just fine for me in iOS6.

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