What do you mean by 'acting up'? what was happening?
I have burned maybe 20 DVD-R and filled up the hard drive and have had 2 coasters and about 5 or 6 errors/reboot happen, once when I was just titling a disc. But nothing consistently wrong. So far, except for the memorex issue, I think errors are mostly due to not giving the machine enough time to set up between commands, esp. when dubbing, recording. That's my semi-newbie opinion so far.