Activesync problems w/ contacts/calendar

[covard]

This is the stangest problem. I have had a pda for quite a few years and have never had a problem like this one. I have used ActiveSync with it. It was an HP iPaq. I am familiar with the partnerships, etc.
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I have sync with two separate pcs. One from work and one at home. Both run XP Pro and both have activesync 4.50 that came with the Omnia.
1. Several times, when connecting, I have gotten an error. "ActiveSync encountered a problem on the desktop. Support Code 86000107". I googled that and found that most of the time, the partnership needed to be deleted. Since I have only one partnership, I deleted the device and then upon reconnecting, it set up a new partnership just fine. But . . . this keeps happening. Why would this happen so often (about every 3 days)??
2. On my home pc, I have troubles with 2 birthdates that won't sync. I have tried deleting them from the pc and they still keep giving me the error, even when they are not on the device at all. The support code on that one is '1'. What would cause this??
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Thanks,