Realms is glitching

When opening the realm, it takes over 5 minutes to get into the realm on good internet. Once I'm in it works for about a minute then it kinda crashes.

I can mine but the blocks just disappear, I can open my chests or inventory. And I can't open any doors. After saving and quitting, logging back in it takes me back to the previous save. My friend who also plays on this realm, is having the same issue.