RRD graphs shows spikes after rebooting

[ggzengel]

In RRD traffic I have spikes which are higher than 100x normal speed.
My real traffic is now 1 pixel high and unusable.
I see this on all interfaces LAN/WAN/PPP.
I see this on interfaces which are not working because the UMTS USB port hung, too.

[ggzengel]

Somebody else have this problem?

What did I make wrong to have spikes in RRD and hanging gateway stats in dashboard?

[AhnHEL]

Have you reset RRD Data from the Settings tab in RRD Graphs?  Might have gotten corrupted.