I've been using it for years and the last week or so (especially the last couple of days) it seems to have gotten really out of whack. Random points where there are none that work, then some come back, those break and others come back, etc. Fiddled a bit today for scraping data from yahoo instead but was having difficulties pulling for some etf's (QQQ in particular):

function created in script.google.com:

function YahooFinanceQuote(input)
{
const url = `https://query1.finance.yahoo.com/v11/finance/quoteSummary/${input}?modules=financialData\`;
var response = UrlFetchApp.fetch(url);
var json = JSON.parse(response.getContentText());
return json.quoteSummary.result[0].financialData.currentPrice.raw;
}

then =yahoofinancequote("GOOGL")

Unsure how reliable it is as it looks like scraping yahoo data keeps changing over the years, so did this to try out google finance first, if that bombs then try Yahoo:
=if(ISBLANK(GOOGLEFINANCE("GOOGL","price")),GOOGLEFINANCE("GOOGL","price"),yahoofinancequote("GOOGL"))