Ping spikes when downloading stuff.

[lightonair]

Jio is giving packet loss in games and speedtest servers, also on discord.

Any possible fix?

 

[Dorababu]

Change DNS in router settings of ipv4 & ipv6 to... "DNS from ISP"
it fixed my slow internet problem.

use MU-MIMO feature enabled router, it will fix your problem

 

[nishantt6969]

Any possible fix?

Yes, I switched back to Airtel.