My opinion on this is that Mio obviously doesn't have enough system resources due to a "poor" hardware to calculate long routes. Maps are becoming more and more detailed with every update and that takes tool on time and system resources when calculating routes, which also depends on complexity of the calculation algorithm of a Mio software. The same case is with some old Garmin nuvi's running latest maps. If I were you I would unlock this Mio and install iGO Primo with the latest HERE maps. I'm sure that Primo is a perfect match for a device like Mio 7500. If you need any support on this, please let me know I can help you. You will not lose anything, and you can gain a completely new experience in navigation.
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