Here is a recompiled srep64 with latest gcc/msys2 and eased compiler flags that *maybe* solved data corruption during compression when computer is under heavy load. To understand the issue better start reading from here:
https://encode.ru/threads/231-FreeAr...ll=1#post56416
If you had same(exactly same not other) issue with latest srep393a through exe/stdio(dont know about cls), and whether this solved the problem or not please let me know.