Why did I always disconnect from Minecraft Server although my Internet is in good condition? Precise about this is in the desc;

Here are the issues;

I continuously disconnected from the Minecraft server although my Internet is in good condition. I use a laptop and not using an adapter such as ethernet, Pardon me if I'm wrong! Well, the issues are I don't use any modem or router, and more likely to use mobile hotspot. So, the issues that I stress are the problem with connect to the variety server. When I tried to enter the private server that my partner made; I always have an issue where the server will kick me out. The server that I join always sent me messages such as ' connection timed out ', ' can't connect to the server ', or ' connection lost ' [ Something like that ]. And when I tried to join another server, the connection just smooth and really well!

Back to my partner server, his friends can join it placidly and doesn't have any problems regarding the issues that stated ' Connection Timed Out ', ETC.

So the thing that I've tried before is to flush the DNS, changes the port, rebooting the devices, turn off the hotspot and then turn it on repeatedly, modify the name of hotspot and password, turn off the firewall, update the drivers, change the DNS addresses and other that I have researched to get this issue fixed,

but sadly turn out the progress or culmination is still same and I still can't connect to the server considerably.

More is that the ping is regularly high when I joined the server but when I tried to join another server, the ping just becomes lower and lower and the experienced become more smooths. Also, the server that I wanted to join didn't have any problems and my partner friends can join it smoothly without any problems that I've faced.

In fact, I don't have any anti-virus software and only using the original that built inside my laptop. I'm using Window 10 Pro and using brand named ASUS with AMD4 A4 type. I've already tried using the command prompt as I already stated in the second paragraph and I already changed the hotspot AP band into 5Ghz Band. Furthermore, my internet around here is really well and smooths and I even can download 5GB software within 50 minutes or more without any problems and I can even watch YouTube or listens to the music or Video Call with my partner during the download period. So, can someone figure what's the problems is and please let me know if you need longer precise about this issue!

Any kind of solution is extraordinarily welcomed!