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unstable ulink2 with xc167

We have an ULINK2 difficult to startup.
We already made these steps:

-enable EXT supply in ULINK2 considering that our supply voltage is +5V
-modify connection to MAX705 from RES line to Manual Reset line, because in comparison with ULINK ULINK2 has a driwer weaker than ULINK RST driver so this is a better solution.
-modify max jtag clock from 1MHz to 200KHz as we read in some follow up knowledge base articles

Now the flash program loading is ok but when we switch to debug the system often show a white page on the PC and the ULINK2 is to reconfigure.
To do this we switch off the target system and unplug and plug the USB cable to ULINK2.

Which other actions can we do?