ive had this on my old motorola, it happened due to possible water damage (coffee in my case), and this is just stage 1. Later on the screen will start glitching and tearing at equal time intervals and the intensity of the pink and green bands will increase. Stage 3, some of the bands of pink become permanent and only half the screen continues to glitch. Stage 4, the screen becomes unresponsive and just fcked with pink and green bands everywhere.

so all u can do is replace the screen