Geeetech

i was able to print the test dog perfectly and now i'm getting under extrusion on every print even the test dog. i'm not sure why?

I got the geetech a10m today and had a few print issues but finaly I was able to print the dog and it came out almost perfect.. I go and try to print something else later and now the print head is like 1/4 of an inch above the build plate when printing... I've re leveled my bed multiple times and ...