This is the 4245th most frequent Japanese word.
何かと
"何かと" means "one way or another" or "in various ways."
何かと忙しい refers to being busy due to various miscellaneous things, where '何かと' indicates a general sense of multiple unspecific reasons.
私は何かと忙しくて時間がありません。
I am quite busy for various reasons, so I don't have time.
何かと大変 highlights the diverse difficulties presented by the new job, emphasizing no singular issue with '何かと' suggesting various aspects.
新しい仕事は何かと大変ですが、頑張っています。
The new job is challenging in many ways, but I'm doing my best.
何かと助言をくれる indicates his tendency to offer advice regarding many diverse contexts, with '何かと' showing a general helpfulness.