The scorm player warning appears when it perceives the connection has been lost. There's a 5 second timeout value associated with those requests - it uses javascript to check for the file '/lib/yui/build/moodle-core-checknet/assets/checknet.txt' - if it can't access that file it assumes that the network is unavailable - the fact you are seeing the alert suggests that network connectivity may be a problem.
Every 10 seconds the scorm player will check it can access the file and if it doesn't get a response within 5 seconds the warning will be activated. The delay or lag in your system could be caused by a number of things so you may need to discuss with your IT dept ways in which you can improve network speed/availability. It may be that at times your network is particularly busy or there may be issues with the network wiring in certain parts of your building for example. Your IT dept will probably want to know if there's any particular pattern to the problem i.e. is it certain users or certain parts of the building that seem to be affected.
Another potential cause is "Web Filtering". Typically an IT dept will use this to monitor and/or restrict which web sites can be accessed by users. This can add significant lag into a network/internet connection. Please see the CLC technical Specifications document which lists the sites you'll need access to when attempting our courseware. It may be worth discussing with your IT dept to see if these sites can be "whitelisted" in order to speed up access to them. There are two sets of servers users connect to when attempting a CLC learning module. The courseware is delivered to the user from the choota gateway (choota.com) and their progress is written to the database servers inside our network.