WIZ820IO start up.

Hi I am using an ethernet adapter WIZ820IO to arduino uno.
my problem is that now and then the unit will not start up when it becomes power.
then I have to use the reset button then the system starts up.

has it something to do with "burn out protection" to do.
Can it be resolved by burning the new boot loader. with new settings?

Are you sure that all hw connections are okay?

yes
checked- cheked and 3 times cheked

Sorry for OT, where do you buyed this module? I think is new ?!?

it's ok.
no need to say sorry. it is always better to ask than to assume
it's newer. you can get them in different places. For example, on EBAY.