DVD pixelization & freeze up

Brand new 24" intel imac. Created an iDVD project which originated in iMovieHD using DV material. Followed all testing instructions (i think), created a disk image (as rec'd) and checked p/b. Everything perfect. Burned DVD (maxell dvd-r) via disk utility, everything appeared fine. Played it on new panasonic dvd player and image pixelated & froze at 15 min mark (32 mins total). Got it unlocked and flipped thru menu, opening screen fine, chapters page fine, able to toggle thru chptrs 1, 2, 3, 4 but locked up on 4, 6 and 7. Tried burning a 2nd time, same problem. Tried burning directly from iDVD (not using disk image) and similar problem but with substantially more pixelization before lock up.
Any advice would be most helpful - Thanks for reading this.
am.
24" intel imac Mac OS X (10.4.8)

The disk image route is the way to go. The additional piece of information you need is when using Disk Utility to make the burn, reduce the burning speed to a maximum of 4x and I prefer 2x. Higher speed burns tend to have more burn errors which can cause problems with many set-top DVD players.
Using iDVD alone doesn't give you any control over burn speed.

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mortified I gave several DVDs to family members recently only to learn the DVD freezes in multiple locations.
• Use to be due to - Use of cheap DVD brand e.g. Memorex, Noname etc. I only use Verbatim
• Type of DVD used - DVD-R plays on more and even older DVD-players
• Burn speed not set down - I set it to x2 when making DVDs to others (iDVD pref/Advance at bottom)
I then shared it with iDVD and created chapters, etc.
• I Share to Media Browser and as LARGE (or Medium if audio get's problematic) NEVER - HD or other resolutions as this will degrade the final DVD result.
I burned it onto a dual layer DVD.
• DL-DVD is much more problematic than SL-DVDs and most of them makes a jump when changing layer. Some DVD-players handles this better or worse
In case it matters, I did the burning in two settings (including quitting iDVD in between the burnings), but apparently this is impacting both batches according to early reports.
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30 copies
• Do not burn more than three DVDs in a row - but let DVD-burner cool down for 30 minutes then burn next set of three. It is very easy to Overheat the laser and this will be an un-necesary repair.
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