The page does not open
Note whether you see a missing-page message or a connection error. Try the home page once, and check whether other ordinary websites load on the same connection. If only a deep link fails, find the film through the current search rather than repeatedly refreshing the same address.
Search opens but finds nothing
Clear the format, year, language and date filters. Try the distinctive part of the name. Love Island UK and Love Island USA are different series, so a season number can exclude the edition you did not mean. A catalog-loading message is different from a valid search with no matching titles.
The viewing service opens but playback stalls
Check the player there. Try automatic quality, stop a large competing download, and see whether the problem affects a second title on that service. Keep the device and error message in mind. Changing one setting at a time makes it easier to identify the useful change.
The list seems to have vanished
Confirm that you are in the same browser profile. Private browsing, cleared website data, or another device can start with a different local list. If you made a backup, paste it into the merge tool on My List. See backup and restore before clearing more data.