What does your switch config look like? Ae you using auto smartports and macros? Those are nothing but headaches for me so I suggest to issue the global command: macro auto disabled and just configure the ports the way you like.
At least turn of auto smartports on the trunk link and hard code that.
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thanks for your reply. Yes, by default it is using smartports, since that configuration is working fine with the SF200 switch. I disabled the smartport gi5, set VLAN 1U and VLAN 100T, then reboot the SPA504G. But few hours later it started again to reboot.
On the uplink itself (gi25) smartport was already disabled.
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