I was Having Error A07 and a friend told me to do this:
Press and hold the power button on the PS3 it will power on then power off.
When it's off press and hold the power button again until you hear two consecutive beeps.
It will ask for the controller to be connected via the USB cable,
Turn on the controller and you will have access to the menu.
Press restart and then you will be able to syn your trophies.
We just did this, as suggested by Fragement85 for my husbands account and it worked the first time he tried it.
I easily believe over a period of over a month, I may have tried 200-300 times without success. I may have tried 50 times or more each on the last 4 attempts (prior to that, I'd try a couple times and give up). It only worked for me in the early morning, and It failed several times even then. It got to 13% and just crawled. It failed at 18%, 21%, and even 83% before finally making it. I got my color changed to green adn my trophies synced.
I do think it's server load, seeing as how early morning is probably the lightest time for the servers.