Russian channel indicates that Ukraine is employing effective EW in the Kherson region which is causing havoc with their communications.
UKR have the advantage they are using secure, frequency hopping, EW resistant NATO radios whilst most Russian troops, if they have radios, are using cheap Chinese fixed frequency sets.
All the6 need is a few old fashioned sweep or barrage jammers and the Russian troops are back to semaphore or carrier pigeons.