When using Safari and wanting to revert to the previous page by using the back key, Safari occasionally opens an unrelated page that I maybe accessed earlier when browsing, sometimes even on the previous day or earlier. Has anyone else had this problem and is there a remedy?
I've not experienced this problem, but maybe you could try to clear out your Safari history? Go to Settings > Safari and "Clear History" and "Clear Cookies and Data." That may prevent it from happening in the future...
I've seen that a few time on my iPhone, and my iPad (more common on the latter though). Usually clearing history and cache fixes it. Every once in awhile it requires clearing all Safari data and restarting the device to fix it.