So I have a very weird audio glitch going on with Portal on my new PC, an Acer Nitro 5.

Certain lines of dialogue are cutting out before they finish, for no reason. Then it's just silence until the next scripted line plays.

Another one of the lines of dialogue, "...been in suspension for 99999...", has been replaced with what sounds like TV static. Some of Wheatley's lines are cutting out, too.

Something is clearly broken here. I don't know if there's something wrong with the soundcache, the PC specs, or what, but I tried reinstalling, verifying the game file integrity, asking the support team, and consulting other Source Engine users, and I still haven't found a solution yet.

By any chance is this a result of the new July 2020 update? Can anyone forward this issue to the staff members?

Apparently, this was the cause of the glitch. After I removed this mod from the game's files, it was all back to normal.

https://gamebanana.com/textures/6013

It was not because of this mod, you probably installed some other voice lines mods like for wheatly and then deleted them, deleting https://gamebanana.com/textures/6013 (well "maps" folder of that mod, in this case you deleted the whole mod with the maps folder inside) automaticly runned a snd_fixaudiocachce command on start of the game(or snd_rebuildaudiocache im not sure) fixing the problem. the best way to fix this glith without deleting anything is to type snd_fixaudiocachce command into a command prompt in portal 2. :D