Poor business internet reliability

hey everyone, hope you're all doing well. so, running a small but growing saas here, and man, stable internet is literally the backbone for us. crucial for daily ops, customer support, everything.

the problem is, our current business internet provider, xfinity business, has been absolutely terrible with reliability. like, seriously bad. we're talking frequent drops, speeds that are all over the place, and it's just destroying our team's productivity. it's also making it super hard to serve our customers properly, which is just not okay. our network uptime is suffering big time.

we've gone through the usual motions, you know? countless calls to support, rebooting the modem more times than i can count. they even had us replace the modem/router twice, which was a whole thing. internally, we've double-checked all our network hardware and cabling, everything seems fine on our end. we even threw in a cellular backup, starlink specifically, thinking it would save us. but honestly, it's just not stable enough to be a primary or even a consistent failover. it's too erratic itself.

• so, i'm reaching out to the community here. really need some help with this. first off, any recommendations for truly reliable business isps out there, especially ones that understand the needs of a saas business?
• second, what are your strategies for robust multi-wan failover setups that actually work seamlessly? i'm talking about something that just *switches* without a hitch.
• and finally, any pro tips to diagnose these persistent isp issues beyond just the basic troubleshooting stuff? like, things i might be missing.