Googlebot found an increase in server errors

Hello,

I posted this issue to *Webmaster Central Help* and they have asked me to 
re-post here. They say many people are having this issue, and it is not 
caused by any user settings. Here is my original post:

Since December 8, the number of crawl errors on my site has increased 
dramatically.  I really don't recall doing anything out of the ordinary.  
After using the fetch as google tool, I've received an email that Googlebot 
has also noticed this increase. The email says to mention message type 
[WNC-786101].  I am getting HTTP 503 server errors. 

In the meantime, I've had a lot of issues with my blog, mainly associated 
with the inability to easily share posts to various social media sites: the 
preview images don't load. I've done a lot of work to try to remedy this, 
adding html tags, and I am still getting inconsistent results.
(In addition, images are not showing up in search results, G+ plus ones are 
not tallying properly, and my stat counter is even giving inconsistent 
numbers!) 

I am at a loss to understand how to fix this problem. I am afraid it is 
outside my understanding of where to even begin. I would be so grateful if 
someone could help me out with this issue. I've spent loads of time trying 
to smooth out the bumps, but to no avail.

My site can be found at http://www.carlastrozzieri.com.

*Thank you in advance of your reply!*

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