Good day! My Syma X5HW recently started behaving strangely. I put a fully-charged battery in it, start flying and get flashing "low battery" lights in 10-20 sec of flying. After 1 more minute it decends or falls down as usual when battery is fully drained. I thought that old batteries were the reason (and even bought a couple of new!) but today while flying together with my friend he gave me his battery - i started flying and same situation occured again - 10-20 sec and "low battery" warning. After that we put this "drained" battery back to my friend's copter (also X5HW) and it showed that battery is normal, no blinking lights and its possible to fly further. So after that I understood that the problem is in the copter itself, not the batteries. What can it be and how to fix it? Capacitor? Change receiver chip? Buy new quadcopter? Thank you!