I've located your details and your equipment is currently displayed as offline, was this switched off manually? If so, could you reboot this for me please so that I can take a look at things from this end for you?
I've been able to run tests on the hub now, everything is reporting back well currently. I don't see any problems with power levels or SNR, there aren't any timeouts showing either.
The network segment also looks good, although there have been some periods of slightly higher peak demand over the past few days, this could be responsible for speed drops.
I'd need a bit more info to grasp the issue, is possible? Have you run any speedtests, if so, what sort of speeds are you getting? Are the slow speeds constant, or only during certain times (e.g. peak times)? Next time you find that things are slow, I'd recommend testing with the hub in modem mode to see if the speeds are any different. It'd be worth running a speedtest at the same time to evidence the changes, if there are any.