melzi with nextion

[bloutix]

i have make many test with melzi 1284p 16mhz board and the Nextion HMI. But nextion isn't really working, it restart again and again after the first initilisation. When I switch on the printer the bootsplash on nextion appear but the timer dont run and then i touch the screen the info page appear but nothing is working the temp of extruder 0 appear one time and i can switch on the fan on time too then nothing else functionnality working. Then it restart in while.