Connection times out with WinSCP 5.15.9

Before this release I used to sign into a remote server via VPN and stay connected with no time limit. Since I installed the 5.15.9 version the session times out. I don't know after how much time. But after a bit when I click on a file, for example, it needs to reconnect again. Is this a change from the previous release? Is there a parameter I should be checking?

Rohit

Please post session log files from both versions.