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CC2540T: cc2540 can't work

Part Number: CC2540T
Other Parts Discussed in Thread: CC2540

one customer have used CC2540 IC, it can't work in the -20 degree environment with 2.4V input power

Two ways can re-work, one is re-set by manual, another is adjustable input voltage to 2.45V, we can adjust input voltage to 2.1V if system have been run up. of course, it can work in the 25 degree with 2V Input

we have try to below way to debug,

1. first board Cap is 100nF, change RC circuit's Cap to 2.2UF, we worry CAP will drop cap value in the lower temp.

2. we have check the power, clock and reset sequencen, we haven't find any abnormal.

could you help provide your comment to deal this issue.