Agree re Friday. Lockridge certainly didn't help him with a poor decision on what should've been a single and if you look at the INF hit it was a grounder to 2B if not touched. The WP of course is on him.
Sunday, I don't know if it was not throwing breaking balls for strikes, or simply staying mostly with the FB on purpose. There were a LOT of balls fouled off, and watching Chapmans' first handful of ABs since a long layoff, there's no way I'd expect him to hit the hard FB but unfortunately it needed to be at the top of the zone & wasn't.
To answer the question at the top, no I don't think at this time it's cause for concern. He'll certainly have some time off after throwing 30 pitches yesterday, or whatever it was.