CUE with single audio file takes time to play

Hello. I’d noticed that playing .cue from single .wav/ape/flac takes time, when playing is not from the start. If I start the first track, it’s ok, and when 1st ends to 2nd — ok. But when I start from 2nd or any other track, cog «loads» track about 15-20 seconds. It is from NAS, but speed is 1000mbps.
Works like that since june at least.

Seems the last version is much better!