During the cold the work equipment works perfectly but after the machine heats up all the work equipment becomes sluggish and others fail completely especially the bucket when digging, where could be the problem
How long you had the machine? How long it’s been going on? What kind of oil is in it? What oil manufacturer is recommending for your temperature regime? Is hydraulic cooler obstructed, what level of oil in the hydraulic reservoir, what condition return filter is in?