2 Red Lights on the Right Side

I received a new Tank x11 unit to replace my old one that was 5 months old. The new unit worked great for about 2 weeks. Now the unit start fine and goes for about 5 minutes and then stops. The front LED indicator shows 2 red lights flashing and won’t move. I reset it and the same thing happens. It just stops and the 2 red lights flash. I really like the unit, but I am getting frustrated with the product. What do I need to do?
Thank you,
Daniel Vasquez