I recently purchased an X and have been using it for over 4 weeks now. Last Wednesday I had a terrifying experience whilst driving, whereby, my vision became kaleidoscopic and since then I have experienced mild dizziness, imbalance and mild head pain which resulted in me being tested for a TIA. Thankfully all tests proved inconclusive but I feel this phone may have contributed to my experience? I've had an iPhone for almost 10 years now and I don't ever remember them giving me head pain and discomfort like this one. Just wondering if anyone else has experienced this?