smart tv = limited cache/memory and no possibility to use vpn.
mag box is old fashion... better get an android box and you will enjoy best flexibility, you can install all apps and also vpn.
e.g. amazon fire tv stick OR xiaomi mi box.
Sounds like TV cache/memory limitation, reduce bouquet list, 2-3 groups only, remove power cable from tv (clear cache) and then try again.
If you need help, feel free to PM me.
No typo in server url, username, password?
Sometimes username or password include small L or capital (big) i letter, have special attention to O and 0 (zero). Try also to reduce bouquet list, in some cases the device has limited cache/memory.
Most smart TVs are very limited e.g. cache and memory.
Better get an Android box which enable you to install all apps, might be also helpful to install VPN :)
most smart tv's having limited cache/memory, and some ISP put speed limits (throttling) on iptv servers... DNS change and a VPN would be helpful in this case, best would be to get an android box where you can install apk files and vpn etc.
better stay with android, apple tv is limited, their app store does not have all apps available and they remove good iptv apps from time to time, there are just a few left, better stay with android.
Instead of "http://myiptv.server.com/get.php?username=USERNAME&password=PASSWORD&output=ts&type=enigma22_script"
you can use "http://myiptv.server.com/get.php?username=USERNAME&password=PASSWORD&type=m3u_plus&output=ts" = that's your m3u link/file ;)
apple tv has too many restrictions, they removed good iptv apps from their store and just a few left and that's why i don't like apple anymore. android is the way to go ;)