In some cases in can be helpful to collect the browser logs to facilitate analysis.
Activate the browser Developer tools
Press the key F12
go to the menu More Tools/Developper tools
the key combination Strg + Shift + I
Save the logs
Two type of logs can help the analysis. Console logs and Network logs.
Reproduce the issue and then save both of them.
Save the log file (e.g. web.openrainbow.com-1561713163213.log)
Note: do not forget to activate the option "Preserve log" before reproducing the issue.
Save the HAR file web.openrainbow.com.har