If the sound in the VAZ-2110 audio system is not fully operational for a short period of time, the problem is either power or power management (if it is common).
In the event that the sound disappears completely and only the bass is left, a possible source of failure is a condenser. It is possible to try another capacitor (larger), in which the protection against the fall of the charge level of the AQB in the amplifier would not have worked in the bass.
If the above troubleshooting methods do not solve the problem, you should also check all the power and mass.