The radio is weak. Does not hold LTE signal long enough. My girl has a Note II she got about 2 weeks ago. Originally, I thought that the Note picked up signal better, but I have back tracked off of that thought because there are times when I have LTE and she doesn't. Without a doubt though the Note will hold the signal longer than the EVO. a noticeable amout of time too.
Also the EVO will not let go of a 1X signal either. This was just to answer your question but this has been discussed on this forum numerous times.