Synonyms for «serious glitch»

Synonyms for individual words can be found below.

I never noted any serious glitches or bugs that got in my way. (wolfsgamingblog.com)
Many have evolved the same workaround for the most serious glitch in photosynthesis,... (newscientist.com)
Smartphone maker OnePlus has began rolling out an update containing a fix for a very serious glitch on Thursday. (businessinsider.my)
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