Yes, the positioning satellites have gone wrong on the job. The satellites send “health” information so we know if they are usable. One problem is when a bad satellite reports that it is healthy.
Other problems can occur when an old satellite is replaced. For example, a few years ago an old GPS satellite was decommissioned and went offline. This caused a timing error for half of the remaining satellites and disrupted all GPS users until the problem was solved.
In 2014, two of the European positioning satellites (#5 and #6) were launched into the wrong orbit. http://www.esa.int/spaceinimages/Images/2018/11/Incorrect_orbits
There are many other examples but those are some of the recent problems.