Hello! This is a very common issue that new users come across and it's because you have multiple events true at the same time for playing an animation so the character will seem to freeze as it tries to play run and attack at the same time.
You have to limit when certain animations are true, so for the 'move' animation you would add a condition 'is not playing attack' or something similar. This means it tries to play move animation only when you are moving the character but not attacking. Whenever you see the freezing issue just check your events and make sure that it won't try and play two animations at once.
For new users it is easy to think that the attack animation will just override the moving animation but this isn't true because events are running constantly, you have to make sure move animation will not play while attacking, same with jump.