Ok.......... I've been randomly crapping out in the middle of my deadlifts for the past two weeks. I'm supposed to be doing 5X5.

Last Wednesday, 300lbs... Did 4X5, got down to do the fifth set and couldn't even move the weight off the floor.

Today I started at 305, but it felt pretty light. So for the second and third sets I changed it to 315. Third set was tough, but not a problem. After finishing the third set, I was thinking about whether to do 320, 325, or 330 next week. Got down for the fourth set and couldn't budge the weight. Took a 45lb plate off each end and repped 225 8 times...easy, perfect form. Put the plates back on, waited two minutes....once again I couldn't budge 315.

I had been taking 3 minutes between sets. I just felt like I needed the time to recover...I don't want to get tired and fuck something up. My hips felt pretty tight today also... I did warm up sets of 135x5, 185x4, 225x3, 275x2.

Any idea as to what could be happening? Is there anything you guys recommend doing between sets so that this shit doesn't happen? It's really, really pissing me off.