nope is not temparory,
NL 4K channels are bitrate HEAVY. So it is normal that switching with these channels are "slo
Every 4k stream is like 15 to 20 mbit. so.. if your player has a 4 second buffer.. it needs to download and encode 100 mbit of data. which just takes time.
Most streams are like 4 to 8 mbit. the SD channels are like that. the H265 channels too (4k quality, but faster channel switching)
About the freezing... yup.. no change.. its a server issue which they cant or want to fix it, which believes me they are just a reseller and their hands are tied.