So Riot lagged my whole game like hell, just hear me out

I was playing jungle Sion, and was always doing the usuals, such as asking my teammates to leash me a blue and so on. I was already happy killing off the golem and when I just killed the 2nd lizard, the lags pops in. It was ridiculous. Everything I clicked has no reaction done by Sion. It was still at a 200 ping, where honestly I can still play normally, but for some reason, everything Sion did is like 5 seconds late. Asked my teammates, they said they were all fine. Then I come to a point where I got shooted out a "Attempting to reconnect" and the ping reveals its true self by shooting from 200 to 500 ping.

So I had no choice but to exit the game and then reconnect the game back. When I manage to get back, we got 3 v 1 KDA, so I realise I have paired with excellent teammates, just that I assume Riot doesn't want me to have all the lucky glory I just wanted, or maybe cause I picked a Sion. When I came back, the lag is gone so I continued my jungling, only to realise the lag has returned just after killing my 2nd monster camps. Again the same thing happened. 5 sec late moves, dead minions still attacking, and everyone is getting damaged by standing on the grass. And something new popped out. After the 2nd "attempting to reconnect" pops out, the champion icons on the mini map disappeared, showing only just me. Filled with anger and frustration, I had to exit the game again with no choice.

Now the 3rd problem. Each time I tried to reconnect back into the game, it does nothing but continuously crashes each reconnect button click at a time. There was a time where I have already reached 100% connection during champ loading screen, game still crashes with the dumbest logic I would know. This went on for more than 5 reconnects.

Finally, I'm at my wit's end. I planned to stop trying to get back into the game. But still, I hate to see my own teammates suffer themselves in the fight alone. So, I tried one last "reconnect", and for some reason, it was successful. As I came into game, it was already 23 vs 51 KDA, and enemies already killed off our bot inhib. My teammates raged me, but I told them it was just the servers as I was still able to surf Facebooks and such with no problem. And I also reminded them there's a chance I would lag again if the teamfights starts again. But the weird thing is.......the lag never happened again..... We are at our demise, enemies successfully pushed mid turret and killed both our mid inhib & bot inhib again, we tried all our best to push off the enemies from our own base, and in the end, we got aced. During the fight, I was never lagging. The lag, never came to me again. I was able to cast my abilities properly with ease now. But due to the slow experience and unfinished builds, we have gotten the most ridiculous defeats of all laggy games I have ever been.

I mean think about it. Lagging like hell from clearing two jungle camps, to the point where I joined the biggest & fattest teamfight involving multiple abilities & ults activation with no lags at all. To me, Riot is just 3 things:

1. They must have hate Sion.
2. They thought start & mid-fight is boring for me, so they choose to lag me off to "relax".
3. They would like it if they made me watch my base being burned down to ruins with my own eyes with the most perfect server lines they can provide.

TD;LR Riot lags me, for 20+ minutes of reconnecting, then comes back with such Google Fibre lines provided by Riot only when my base is crushed down.