One Step Update Issues CC-501

for the past 7-10 days I've had many problems with One Step Update. These occur whether the update is for one account or multiple accounts. They tend to occur with my credit card and bank accounts, not investment accounts. The error code is usually CC-501 - Unable to update because of a problem on the Quicken server. When this happens Task Manager shows QW.EXE running at 23-25% CPU utilization (100% of a single core). If I let it run to completion, (5-20 minutes or more) it sometimes reports success, but most of the time it reports an error on a single account. If I retry that account it will update successfully in just seconds. Today I had to kill the Quicken task multiple times trying to update one of my two checking accounts. I rebooted my system and the account successfully downloaded a half dozen transactions in under 10 seconds. BUT STILL REPORTED THAT THE UPDATE FAILED due to a CC-501 error. I re-ran an full update on all accounts. Quicken ran for over 25 minutes and reported CC-501 errors on both checking accounts and 3 of 8 credit card accounts.