Is there any way around this?
If i was to use advance trade and set sell limit orders for when a coin reaches a set price, will the order go through or will it not due to the exchange struggling?
That's so strange that you faced this issue, till now in my time in crypto I have not faced such an issue that my balance is showing zero, this is a waking call for you to change the exchange, there are plenty of other dexs and cexs that you can prefer to avoid such errors, and talking about limit orders, I can say that they will be executes once reaches.
But no one from here can ensure you 100% but the coinbase support or team can assure it, you should report this issue to them, and try to keep the app up to date, I don't use coinbase, but Binance and I never faced this issue there. And talking about trading volume it was not that much that exchange is not able to handle, I think its not a volume problem but might be an internal problem, technical one.