The phrase "tech glitch" means a small problem or error that happens with technology, like a computer or phone, which can cause it to work improperly or stop working for a short time. Full definition
Well, well, we had a major tech glitch last week, so I was unable to update the blog. (frenchbydesignblog.com)
You should also have a contingency plan in place for unexpected issues, such as tech glitches or revisions that take longer than expected. (elearningindustry.com)
This reduces the risk of complications on launch day so that you can focus on other matters, like tech glitches. (elearningindustry.com)