Did you ever solve this? I installed IGO 9.18.27.736653 on my Chinese head unit and suffer from the same problem.
The problem: long routes (> 500 kms) to different countries keep recalculating indefinately, the estimated time fo arrival keeps alternating between the current time and the calculated arrival time. What i also noticed is that on routes that suffer from this, no route info is shown in the 'route summary' screen where it says 'start navigation'.
The problem is not 100% related to navigating t a different country: if i plan a route to a nearby country with a shorter distance (ie 300km) all works well.
maps: iGO R3 TomTom [TeleAtlas] 2020.12 (Q4) EUROPE
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