The most common and most likely answer to this crossword clue is the 8 letter word GREMLINS
I've seen this crossword clue in Financial Times
G
R
E
M
L
I
N
S
More clues leading to the result GREMLINS
Buddy explains!

The straight part
We know that "Problems" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case problems = gremlins.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does GREMLINS mean?
GREMLINS noun- A mythical creature reputed to be mischievously inclined to damage or dismantle machinery.
- (by extension) Any mysterious, unknown source of trouble or mischief.
- A young inexperienced surfer.