I have a TA 1021 and I really love the mobile.
Only problem is the signal. I made test with my colleagues which have the same provider (Vodafone IT) and they all have way better signal and speed. We all have same sim and contract, and we tested in the same place, with same speed test software (inside Vodafone App) and I got the worst result. THe other mobiles were Huawei and Samsung.
Has this something to do with Oreo update? Can you please check and fix?