Hello, have a question :
Is it ok, if phantom 4 losing connection at 500 m right above me ?
google coordinates, so you can check environment : 55.480457, 37.390369

How are your antennas positioned? For the most part, that is normal given how the frequency distributes:

Antennas were positioned, how in this picture :
Next question - is it safe to touch antennas during flight and adjust angles ?

It's fine if you touch antennas during flight and adjust angles.
Please fly it farther firstly then higher, try to do not fly it right above your head.