The recording is reaching the maximum size allowed.
Please review the Global Setting for "Maximum Recording Size"
This is set to 500MB by default, the maximum configured size is 800MB (2.5.915 and below) or 2000MB (2.5.916+)
To change this setting and allow larger recorded sessions please follow the below steps:
1) Login to the /ADMIN portal with a SysAdmin account
2) Select “System Status/Settings” | “Global Settings” from menu
3) Find Option “Maximum Recording Size” under “PSM Session” Category
4) Increase the “Setting” value to a more acceptable size
This Global Setting was introduced in TPAM version 2.5.906. In version prior to 2.5.906, the limit was 500MB (not configurable) and no warning was displayed.