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Hardware Reset Problem

Hi,

Setup:
I am using C8051F124 MCU. I have configured UART0 for serial communication to acquire real time data.

Problem:
When I do hardware reset (i.e. pulling down the RST pin on the MCU), the system halts and does not come up again.
On the other hand when I do a power cycle with a pause of almost a sec, then the system restarts and is up and running again. Repeating the power cycle with the pause is of short duration, like about 200msec or lower the system again fails to come up.

Other Details:
The system is running at 50MHz
RSTSRC = 0x06 on initialization

Please help to identify the mistake I am doing.

Kind Regards,
CM