This issue started a few weeks ago. I average 4 miles-plus walking for exercise everyday. I have iPhone in pocket and Apple Watch on wrist. I use the Adidas Running app - installed on both devices. As I'm walking, my phone starts to dial random people; sending random text messages; and various apps just start opening up - unbeknownst to me until I stop. Then I notice it has tried to call someone; or tried to dial out the SOS emergency number. Or sent a text message or two with crazy characters, at times being vulgar. I will have webpages open in Safari I've never even visited. Again, phone has been in my pocket the entire time; haven't touched it; no visible audio signals, beeps or anything. The people it tries to call or text will respond asking if I tried to call or ask if I'm ok. At first, I thought it was maybe Siri mistaking my "huffs' and "puffs", etc... as trying to call or open an app. So I turned "Hey Siri" completely off. But it still does it. I've been walking everyday for years w/phone in pocket and this recently started happening. Any clues to what could be causing this? Or where to find info? Thx in advance!!