I once reported a similar problem with Texel when using 1.15.12 and NAES After lots of cut&paste it would abruptly freeze on a cut or a paste. I could kill and re-start it once and use it for a while but the next time it happened it would lose the file I was working on and also refuse to start properly until a reboot was done. The problem disappearred with 1.16 and XAaes Peter