Why does Doro 8030 keep cutting off during calls?

My phone keeps cutting me off during calls which is  caused by my ear touching the screen. This enables the aeroplane mode and/or the wifi connection (which I don't use). Even though I've turned off the notification panel and also activated "Lock screen during calls" It still does it and also, annoying, it keeps buzzing me when I'm talking to people for no reason.  Anyone any ideas how I can fix this? I love the phone but it's a bad design having the panel switches for wi-fi, aeroplane mode etc next to the earpiece, particularly as I am hard of hearing and this phone is designed with people like myself with hearing difficulties who, by nature, always press their ear to the phone to hear better!

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