Thanks for reaching out here in the Community!
Did you restart your Roku TV before re-installing the Lifetime channel? That step is crucial when performing troubleshooting. If you haven't tried the suggested order (remove > restart > re-install), we would recommend giving it a shot once again. We also suggest doing the restart from the Settings menu by navigating to Settings > System > Power (If you do not see a Power submenu, skip to the next step.) > System restart.
Let us know if there's any difference after.
All the best,
Roku Forum Moderator