strange signs appear in my files

Hello,
since my last update to version 5.0.6 appeare very often these signs in my files: 'ÿ ht 㰐' - in various combinations often only the 'ÿ' .
For me this is very disturbing, because the php file stops working and in the first moment I dont know why. then it is often very hard to find these signs in a big file.
Is there a solution to get rid of these signs?

Regards, Hago

This has happened to me at least 8 times on Windows 10 with versions of PSPad like 5.0.x. I don't know a fix for it. It happens in my Perl programs and when I run the program I get an error. I find and remove the wrong characters.

I looked for a fix but have not found any. The author says PSPad 5.0.7 32 bit is more stable so you can try that one.