Which part stopped?
A catalog page that will not open, a viewing link that leads to the wrong country, and a film that buffers are different problems. First note the exact page or app where the failure happens. If FlixtorTV search works but the destination player stops, focus on that player rather than repeatedly changing the catalog query.
For a page-loading problem
Reload once and try the homepage or another title. Missing images or unstyled text can mean that only part of the page loaded. Check the connection and whether the issue affects other websites. Keep a backup before clearing browser storage, because My List and checkpoints are stored there.
For a viewing-choice problem
Check the selected country and confirm the title's year. Similar names can send you to an unrelated production. If the available offer has changed, return to the title search and compare the current edition rather than relying on an old bookmarked offer.
For repeated buffering
Try a lower quality if the player offers it, check other network use and confirm that the browser or app is supported. Change one thing at a time. If an error code remains, keep it together with the device and title when consulting the viewing service's help. A new proxy address is not a universal answer to a playback fault.