In-place update of web service causes CPU spike

I've done many in-place updates of my production service with no issues. Today when I ran an update the CPU spiked on both instances to around 99.6% for almost an hour. The CPU eventually came down to its normal range while under the expected load from the
service. I didn't see any requests fail, but response times were up significantly.
I ran another in-place update later in the day and the same thing happened again. Currently my production service is pegged at over 99% for over an hour. Thankfully this is a slow time for the service, otherwise this could be a real mess for me.
Before each in-place update I deploy to the staging environment and everything is working as expected (there's nothing on the staging environment before as I delete it every time the production environment is successfully updated). As a test I did the same
in-place update on the staging environment and that environment has been at 50% utilization for an hour now. It starts as soon as the update takes effect for each instance (one instance pegs a couple minutes before the other).
I have profiling turned on for this service, and when I go to look at the profiling report I generally get these messages:
5:51:24 PM - Connecting to the Profiling agent on the VM instance
5:51:27 PM - The Profiling agent is preparing to process the request
5:51:28 PM - Preparing the Profiling logs on the VM instance
5:51:42 PM - Uploading the logs from the VM instance to the Windows Azure storage account.
5:51:43 PM - Profiling log request failed. Details: Profiling agent failed to upload log snapshot to Windows Azure storage account.
I'm not sure if it's related to profiling or not, but I'm wondering if there is something broken with the in-place update process in Azure?
Any help is appreciated.

As further investigation I deleted the staging environment, re-deployed to it, and that worked just fine, CPU levels were normal. I did the VIP swap, and my production environment is back to normal.
The staging environment (old production env) continued on it's spike for one of the instances. I checked and the instance that isn't spiked is the one I successfully got a profiling report on. I'm going to wait an hour or so and run a profiling report on
the other instance to see if that also gets the instance back to normal CPU times.

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