23x0 series are low-memory units, only 64MB of RAM and so problems with planning very long routes is not uncommon, but crazy routing like that is not explainable by lack of memory. More likely you need to hard reset it or better still clear nonvol: [Only registered and activated users can see links. ] and [Only registered and activated users can see links. ]. Back up your favourites first if you want to restore later.
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