2.1. Check your NT version installation Article

1) Use the latest NT version m 8.1.3.1,  and never use any 8.2 versions. 

For best practices, please follow the recommendations below:

2) Back up your NinjaTrader account

3) Uninstall all other 3rd party indicators possible. You may reinstall them later, or restore from backup.

4) Clean up your database, cache, and temporary folders inside Documents/NinjaTrader8/

6) NT platform: check mark Multi-provider: Tools/ Options/General/ Properties: Check mark Multi-provider

7) NT platform: Checkmark Show Tick Replay: Tools/ Options/General/ Properties: Checkmark Show Tick Replay