Red SOS Flashes (+1 solid red) When Trying To Enter Listening Mode On Photon

The firmware running on my Photon appears to be working fine, however when I hold down the SETUP button to try and enter Listening Mode I am getting the red SOS flashes instead of blue blinking. It then automatically resets and my firmware continues to work fine until I try to enter listening mode again. Any ideas as to what could be causing this? Thanks!

If you enter safe mode, and then try listening mode, does that work for you?

Before seeing your reply I had tried unplugging and restarting my Photon several times, and the problem finally went away (the first couple restarts did not fix it)… so currently I cannot test your idea of entering safe mode first, but the next time the issue pops up I will try this. Thanks!