Losing the posts that I compose has been a chronic problem that never went away. It was less frequent but still was happening at times. It’s predicated by the screen becoming unresponsive for a few seconds and I believe also when the ad changes.
I was on the latest iOS and Safari. Since it had been continuing for so long (although with less frequency) I loaded Firefox to see if it would go away. It is far worse of an issue with FF. HOWEVER, when in Safari (when first launching a session - or having been off of VN as the active window for a long time) I must wait 30-45 seconds for more than just the first dozen or so posts to load and the screen to become responsive. When I use Firefox the touchscreen interface is immediately responsive and all posts load immediately upon starting a session.