Hi montesuma,
in a different thread, someone pointed out that their reverse proxy was tinkering with the headers and caused the initial authentication header the client sends to the Mattermost server to be dropped and therefore the sessions had to be recreated everytime they started the application.
Can you please describe your server side setup a bit more? Do you use a reverse proxy in front of your Mattermost server and if so, what does its configuration look like? Are you working on some of the request headers in there in order to modify the loadbalancing algorithm or anything like that?