If you are in EPG search and you exit and re-enter the screen, sometimes you will return to the screen with the same programs/episodes shown. Other times it will reset itself. This is not consistent behaviour.

A fix is available as part of the other EPG search fixes and performance enhancements.

http://forum.team-mediaportal.com/mediaportal-releases-315/patch-fixes-epg-searching-issues-including-speedups-92239/