Hi Sergey,
now, it becomes a little bit difficult without the hardware at hand. But you may try the following: In MCSM0, you set the PO_TIMEOUT to the smallest possible value. could you increase this (0x10 -> 0x18 or 0x1C)? This allows the oscillator to become stable.
Try to send a huge preamble: if continuous communication works, but packet mode does not, the preamble may improve the fix. -> MDMCFG1 = 0x70
Maybe, the TI experts can advise if the FOCCFG settings are correct. I am not sure about FOC_BS_CS_GATE.
Regards,
Dirk