Weird issue happening for about a week.

Turn on turn signals (either one) and apply the brakes at the same time, blinkers stop, on the front turn signal light, it stays on solid on the side you are turning. However, BOTH rear lights stay on solid. When the brake is not applied, the front signal works properly, but BOTH rear lights blink at the same time. This happens no matter which direction you have turned.

Any ideas? It did this about 2 years ago for a couple days, but fixed itself and had not re-occured.

No bulbs burned out, I already know that drill.

This has been a banner month for my 7 year old truck as far as **** breaking.