Currently reminders are added automatically to investment account balances for ENDING and CURRENT balance. Cash accounts have the option to include or not include reminders in the current and ending account balances.
For background about this issue please refer to :
Quicken 2nd tier support requested that this idea be submitted so that this issue can be fixed. They would like to make cash and investment accounts behave similarly (like the cash accounts) regarding reminders, but consider this to require a feature request via Idea votes.
So please vote.
[Edited - Fixed Link and moved to Windows section of Community]