JDM Legacy CVT and warning lights saga

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Help really needed as I'm close to imploding. V. brief story so far - 2012 2.0 DIT Wagon with 99k on the clock and CVT 'box - jerky gearchange at lower speeds. Gearbox oil change, no improvement but after long journey dash lights up with multiple warnings including flashing gearbox oil temp. 2nd 'box change plus internal filter and, because excessive wear on part,  (piston complete clutch transfer bearing) replaced. Long drive, smooth 'box, all seems good. Day later, brief drive - all warning lights on but otherwise drives fine. Options? Work so far done by non-Subaru but trusted garage. Considering swallowing dealer charges in hope that they can diagnose - any and all advice welcome.