Did you set the current on your drivers? Sounds like they might be overheating.
If you have please answer these.
These things should all be included in your post. It makes it much faster to diagnose problems.
1) Did you buy everything from here?
a)If you didn’t or changed some things please don’t leave out any details.
2) Are you using end stops?
a)If so please disconnect them.
3) Are you using all my recommended parts?
a) If not please list what parts you used.
4) Include a picture so obvious errors might be spotted.