It could be a connection issue, but could also be browser issues, conflicts with addons (like ad blockers, etc.) or any number of other issues.
1) Read this thread on how to troubleshoot and report issues:
https://www.backyardchickens.com/threads/how-to-troubleshoot-report-problems.1173246/
2) If the troubleshooting tips don't help, start a new thread and please include as much detail as possible about your problem, for example:
• Are you on a computer, tablet, phone.
• If phone / mobile, which model? If computer, which operating system and version?
• Which browser and version are you using (eg., Chrome 58.0.3029, Firefox 3.5.9, Internet Explorer 8, etc.)
• Have you deleted your internet cache / browser history of files and tried again?
• Have you tested a different browser (this helps us isolate if the problem is browser related or not)?
• What EXACTLY did you do? Document the steps you took before having the problem.
• Copy/Paste the exact error message you received (screenshots are best).
Thanks, and we look forward to getting your problem fixed!