My company for the last 10 years has been using Mercer for our 401k. It was great because in Quicken (currently running 2017 version) it would update every time I ran the "Update Accounts" process. I REALLY liked this feature.
Now we use Transamerica. They do NOT have "live" Quick integration and I need to manually download/import account updates. I hate this.

What is the proper manual process to keep my account balance in Quicken accurate? Can I do it each week? Should I do it quarterly? I don't know how to establish a proper process.
I deleted my account in Quicken and downloaded the fresh transactions when we went live with Transamerica. Since then (about 60 days), if I download the YTD transactions, the balance gets all screwed up so I must be doing something wrong. Must I now keep track of the dates I download/import so I don't overlap or something?
Any advice is appreciated.
//Troy