Our IT team is looking into an issue that is unrelated to load but is related to a possible issue with our provider (architecture, DNS, routing, etc all being looked into right now to see what is causing issues even when the site is not under load).
Also upgrade is only a pricing indication. TONEX Upgrade means the standard mid-tier TONEX product, it won't upgrade that to MAX or specifically SE to TONEX. Your SE version is a qualifier for that upgrade-priced version, but it is just that - a qualifier. To upgrade to TONEX (I called it "TONEX standard" personally, to avoid confusion and have pointed out we could do similar publicly) you can have any of the following for example:
TONEX SE
AmpliTube 5 MAX
AmpliTube 5 MAX Upgrade
AmplITube 5 SE
AmpliTube 5
AmpliTube 5 Upgrade
AmpliTube 5 MAX v1
AmpliTube 5 MAX v1 Upgrade
AmpliTube 5 MAX v2
AmpliTube 5 MAX v2 Upgrade
AXE I/O Solo + AmpliTube 5 Bundle