crossover on fulllock CLUNK

[coleman0113]

hello guys
fitted coilovers like 4month ago and they was fine now through the winter when i turn the steering wheel left from right when it crosses over it clunks any suggestions
could it be there nt greased and the cold weathers making them cold cus it sounds like their jumping on the bottom mount
P.s does any1 know if there guna be a corsa b stand at santapod in june for the performance vauxhall meet cheers guys