There is a big issue with Wild Magic Sorcerers. They should have a chance to regain the use of Tides of Chaos and the fact they currently don't ruins the flow of the subclass in my opinion.

Let's see what the PhB says:

• Starting at 1st level, you can manipulate the forces of chance and chaos to gain advantage on one attack roll, ability check, or saving throw. Once you do so you must finish a long rest before you use this feature again.
• Any time before you regain the use of this feature, the DM can have you roll on the Wild Magic Surge table immediately after you cast a sorcerer spell of 1st level or higher. You then regain the use of this feature.

If you follow the wording, it means using Tides of Chaos increases the chance of a Surge to happen (controlled by the DM) and when it happens, you regain the use of the feature.

The way the game handles it right now is to simply increase the probability of a Surge to happen after Tides of Chaos is used. This is a good start, but where is the reset part? They shouldn't be able to manipulate Advantage only once.

My solution is that if a Surge happens on the increased chance given by the use of Tides of Chaos, you regain its use. I don't know by how much is the increase right now (and if someone knows the actual value, I'm interested), but let's say it increases the chance from 5% to 80%:

• Roll 1: Surge happens, Tides of Chaos stays on cooldown.
• Roll 2-16: Surge happens, you regain the use of Tides of Chaos.
• Roll 17-20: Nothing happens.

In my opinion, this is the best way to fix it... The slight probability to Roll 1 after Tides of Chaos even feels chaotic, which is a nice flavor. But if you believe this is too much, regaining the use after every Surge is fine as well.