From a Jet2 standpoint, there's almost always enough staff. There have been issues with the reclaim belts/system though. Either:
The belts are getting "clogged" after only 40 bags (average flight could have 120-180, belts are designed for 2+ flights), which engineers have been working to fix
Or they're being overrun when 4+ flights land at once, which is usually in the early hours.
This week it's been a combination of the two.
I've also heard that recently, when multiple flights land and park at remote stands, one bus has been sent to meet each flight, rather than multiple buses offloading one flight at a time. This has caused baggage reclaim to be very disorganised and the belts aren't being cleared as quickly as they would normally.