[Plugin: Google XML Sitemaps] Can manually build sitemap but auto fails (XML-Sitemap)

If I go to xml sitemap and click the manual build link, it finishes in about 30 seconds using 80 megs memory. Sitemap file looks fine. I am only building the xml file. (wp 3.02)

However, the automated always fails. When I log in it shows red error messages that the build failed -# The last run didn’t finish! Maybe you can raise the memory or time limit for PHP scripts. Learn more
# The last known memory usage of the script was 63.75MB, the limit of your server is 256M.
# The last known execution time of the script was 20.34 seconds, the limit of your server is 120 seconds.
# The script stopped around post number 22219 (+/- 100)

If I run the debug, I see nothing out of the ordinary several different days I have checked.

However, one clue — I just installed phpbb and the plugin that allows single sign on. NOW, in the debug building of the sitemap I see a while bunch of these messages (with offsetts of 1 or 2):
Errors, Warnings, Notices
[phpBB Debug] PHP Notice: in file /wp-content/plugins/feedwordpress/syndicatedlink.class.php on line 129: Undefined offset: 2

Not sure if this helps at all:

GoogleSitemapGeneratorStatus Object
(
[_startTime] => 1291815252.73
[_endTime] => 1291815287.85
[_hasChanged] => 1
[_memoryUsage] => 85196800
[_lastPost] => 38569
[_lastTime] => 1291815287.34
[_usedXml] => 1
[_xmlSuccess] => 1
[_xmlPath] => /….com/sitemap.xml
[_xmlUrl] => http://….com/sitemap.xml
[_usedZip] =>
[_zipSuccess] =>
[_zipPath] =>
[_zipUrl] =>
[_usedGoogle] => 1
[_googleUrl] => http://www.google.com/webmasters/sitemaps/ping?sitemap=…
[_gooogleSuccess] => 1
[_googleStartTime] => 1291815287.35
[_googleEndTime] => 1291815287.49
[_usedYahoo] =>
[_yahooUrl] =>
[_yahooSuccess] =>
[_yahooStartTime] => 0
[_yahooEndTime] => 0
[_usedAsk] => 1
[_askUrl] => http://submissions.ask.com/ping?sitemap=…
[_askSuccess] => 1
[_askStartTime] => 1291815287.49
[_askEndTime] => 1291815287.62
[_usedMsn] => 1
[_msnUrl] => http://www.bing.com/webmaster/ping.aspx?siteMap=…
[_msnSuccess] => 1
[_msnStartTime] => 1291815287.62
[_msnEndTime] => 1291815287.85
)

also:
[active_plugins] => a:11:{i:0;s:31:”feedwordpress/feedwordpress.php”;i:1;s:33:”gd-star-rating/gd-star-rating.php”;i:2;s:36:”google-sitemap-generator/sitemap.php”;i:3;s:35:”publish-2-pingfm/publish2pingfm.php”;i:4;s:32:”sexybookmarks/sexy-bookmarks.php”;i:5;s:39:”si-captcha-for-wordpress/si-captcha.php”;i:6;s:39:”wp-facebook-like-this/wp-fblikethis.php”;i:7;s:24:”wp-followme/followme.php”;i:8;s:19:”wptouch/wptouch.php”;i:9;s:14:”wpu-plugin.php”;i:10;s:47:”zamango-page-navigation/zmg_page_navigation.php”;}

http://wordpress.org/extend/plugins/google-sitemap-generator/