I have a 2009 4wd Chev Colorado. The 4wd lights stay flashing. Is it okay?

So the one reference I saw about unplugging the fuse and replugging won't take care of it? How could it go from being okay in drive til when I parked and then when I backed up maybe 10' in 4wd, the problem started. Is backing up straight in 4wd something you should avoid? It does it in 4low and now it is flashing in 2wd since this afternoon.

electrical problems can happen any time. its just one of those things