Hi Monster,
Just to update on my findings...
PND, MTK, WinCE 5.0, 64MB Ram = OK
PND, SirfV, WinCE 5.0, 64MB Ram = OK
PND, SirfV, WinCE 6.0, 64MB Ram = KO
seems that running on CE 5.0 is more stable than on CE 6.0, probably because CE 6.0 use most of the memory resources... however, after running several times on CE 5.0, i do get the memory warning sometime.. but other than that it is rather stable...