The main one was CXCONSUMER when I ran sp_whoisactive at the time it was spiking

I can't see anything out of the ordinary running when we see these spikes, when I run sp_whoisactive there doesn't appear to be anything there that's not running at other...

Yes, I'm sure that it's SQL Server as I've watched the individual process and it's that going up to 100%.

Thanks, I'll try that the next time it happens

Unfortunately 2016 isn't currently an option, licences have been bought for 2014