This is my schematic which is very simple. I have few PBs that I have connected through some pull up resistors to digital pins. When I press a PB, a message is sent to LAN through W5100 module.
Everything was working well until recently. Now, very randomly, if I press a PB, it causes reset.
The power supply is an unknown Chinese 12+ model and ( IMO ) can handle excesses current consumption.
Any idea why this is happening?