As you say , this is in base kodi error and i ask for solution your or myself. LTS i mean is as is, then try help with solve this annoy issue with TV channel switching hang your build KODI compete but ssh still works.
The long-term support is for the system itself, not for Kodi. Unfortunately, Kodi developers don't provide short-term support either, so when a new version is released, there's usually no update for the old version, regardless of whether it runs on certain platforms or not.
If this bug is really the same as the one I linked earlier, then it should be backported, but the fix only arrived for versions 20 and 21. Since there were quite radical changes from 18 to 19 (dropping legacy amlogic support, replacing python2 with python3, etc.), so I wouldn't say that backporting to 18 is impossible, but it would certainly be a very looooong task.
Unfortunately, I don't have enough time to try to patch this at the moment, moreover I can't test it, because I don't have any television broadcasting source that uses ISA.
I will probably end LTS support with the release of the first stable version of Kodi Piers (v22).