Problem to Initialise with E8a

I am using for several months the E8a debugger with a R32C111 without any problem.

Suddenly I am facing an error message "Failed to erase the flash rom" when I tried to initiate the E8a.

I didn't change anything to the hardware, it just happened one day after working perfectly

the day before.

I check the power suplied by the E8a and discover the voltage delivered is too low

2,8v when 3.3 was selected from Hew interface or

3,0v when 5.0 was selected from Hew interface.

If I tried 10 times it finally works but really would like to understand and fix it.

Is anybody has an idea ?

Thanks Jean-Pierre