There can be various reasons behind the interrupted services of your printer. It does not matter what the reason is; not getting a print on time can be frustrating. The answer to your question, why is my Epson printer not printing in color, is:
The paper type settings do not match with the paper you loaded.
You must have selected the Black/Grayscale setting in your printer's software.
Nozzle heads of your ink cartridge are clogged.
Ink levels in the ink cartridges are low.
You are using an outdated version of your printer's driver or software.