Eve Muirhead's Scots have suffered two more defeats at the World Women's Curling Championship in Canada.
Korea swept to a 7-2 win over Scotland and the United States secured an identical score in Muirhead's fifth match of the round-robin tournament.
"I'm really struggling with the stones out there," admitted Muirhead.
Scotland now lie seventh in the 12-team table with a record of two wins and three losses, behind leaders Korea, Canada and Sweden who have four wins.
The Scots opened the tournament with an 8-7 defeat of Russia, but Muirhead suffered a 7-6 extra-end loss to Germany before beating the Danes 8-6 over the weekend at the event in Lethbridge, Alberta.
In Monday's games, Korea built up a 4-0 lead by the fifth end before the Scots pulled back single shots in the sixth and seventh ends.
But a double in the eighth for Korea skip Ji-Sun Kim and a single point in the ninth secured her rink a comfortable win.
“We're not out of the championship and we're still right in the mix, so I don't think it's something to worry about”Eve MuirheadScotland skip
The Americans' win over Scotland is their only success in the tournament so far.
After blanking the first end, the USA scored two in the second when skip Allison Pottinger had a nose-hit for two.
Scottish mistakes gave them steals in the next two ends for a 5-0 lead.
The Scots scored a single in the fifth and another in the seventh before conceding at 7-2.
"It's difficult to say what's wrong," added Muirhead.
"It's one shot every end that's catching us out.
"They're a really tricky set of stones and they're getting on top of us a little bit.
"It's not just us that are struggling out there. I think a few teams are.
"We've had a lot of pressure on our shoulders coming into here, pressure we didn't need, so we're just going to go out and play how we know we can play and just make the simple shots well.
"We've only lost three games. We're not out of the championship and we're still right in the mix, so I don't think it's something to worry about."