Is the issue or error came from LNBig?
I really have no idea, that's what I'm trying to solve.
I never heard of this site before but I tried to search and check their About page if they have contact info.
I believe LNBig runs some of the largest nodes on the lightning network, so they're quite popular,
I've opened multiple channels to them on different wallets for more than 6 months. Never had this issue.
I've never contacted any node provider before opening a channel, I really have no idea how that's even supposed to work.
I've always just opened a channel and use it. Some providers just kick me out immediately and with others just keep working.
Why would you use a third party if you can open a channel with Electrum?
In this particular case I want to use the Boltz swap service so I need a node that's well connected to them and reasonably priced and LNBig 20 is perfect fit for that. I've tried other channels with other nodes before but sometimes they don't work at all, routing issues or other issues and it's just very stressful especially if you swap on-chain to LN, you have to wait 24 hours or more to get a refund. I need something that's guaranteed to work with minimum fuss.