CC2650 5XD can not set 5dBm tx power with LFXOSC

Hi

I need set tx power at 5dBm, sometimes it's OK, sometimes not.

The OK situation is:

1. CC2650's silk is 82J, that means IC is producted in 2018
2. Use LFXOSC(32.768kHz). The osc is FC-12M.  And it works OK 

In this situation, if CC2650's silk is 78J, that means IC is producted in 2017. It can not work, and reset after HCI_EXT_SetTxPowerCmd(HCI_EXT_TX_POWER_5_DBM) is excute.

But if i modify the ccfg, to use internal RCOSC(32.8kHz). Then it works OK. 

I use the SmartRF studio to control my board(82J ic and 78J ic), they can work in 5dBm. So i think CC2650 may not use LFXOSC when controled by SmartRF studio.

So my question is: The 2017's CC2650 hsa the glicth? What should I do to set 5dBm when i use the 2017's CC2650 with LFXOSC?