Mumbai high ms/ping

hi I've been playing with my friend in Mumbai server for a month now, the server was fine, he's been getting 45-50ms average but today he's been getting 260ms, literally unplayable but for me it's the same. No idea what happened because yesterday his ping was completely fine. He tried his own region in EU and we can confirm it's not his wifi issue. Any fixes? Or is this the server issue?