estrwan

sure security updates is most important thing i would like to get and that's why I'm asking for help I'll do it one more time 

Welcome to the forum!
What's the actual problem? Can you please describe it in as much detail as possible.
How often does the problem occur? Is it a constant issue or does it seem to occur randomly?
Let us know and we can work out how best to troubleshoot the problem further.

Does this problem only apply to Wi-Fi devices, not wired devices?
I wouldn't suggest using a firmware that old, if possible please re-upgrade to the latest and factory reset the XR afterwards. If the problem is still occurring I'm sure we'll be able to find a solution for you.

You can stay on that version if you wish to but it doesn't have all the security updates and latest features. I would suggest as above to upgrade again, factory reset then don't change any settings at all, if it happens again then please get us the log from the System Information page on the router and we can take a look.