Such errors are typical memory issues. Increasing a cache size (?) will not solve that.
Raising the memory limit for PHP will.
If you can’t raise the memory limit, you should consider better hosting or use less plugins.
I’ve seen sites that uses 50+ plugins, that’s a bit much 🙂
But likewise I’ve seen webhosts that limit sites to 32/64MB which is very lean.
Most sites make do with 96 or 128MB memory. My site, ajdg.solutions, has a higher limit because of plugins like WooCommerce and just the combination of a larger number of plugins.