diff --git a/csaxs_bec/bec_ipython_client/plugins/flomni/flomni_webpage_generator.py b/csaxs_bec/bec_ipython_client/plugins/flomni/flomni_webpage_generator.py
index 4a0abda..945856a 100644
--- a/csaxs_bec/bec_ipython_client/plugins/flomni/flomni_webpage_generator.py
+++ b/csaxs_bec/bec_ipython_client/plugins/flomni/flomni_webpage_generator.py
@@ -235,6 +235,16 @@ class HttpUploader:
         self._uploaded: dict[str, float] = {}   # abs path -> mtime at last upload
         self._lock     = threading.Lock()
         self._busy     = False   # True while an upload thread is running
+        self._warn_at: dict[str, float] = {}    # key -> epoch of last warning
+
+    _WARN_COOLDOWN_S = 60   # only repeat the same warning once per minute
+
+    def _warn(self, key: str, msg: str) -> None:
+        """Log a warning at most once per _WARN_COOLDOWN_S for a given key."""
+        now = _epoch()
+        if now - self._warn_at.get(key, 0) >= self._WARN_COOLDOWN_S:
+            self._warn_at[key] = now
+            logger.warning(msg)
 
     # ── Public API ──────────────────────────────────────────────────────────
 
@@ -297,7 +307,7 @@ class HttpUploader:
             import urllib3
             urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
         except ImportError:
-            logger.warning("HttpUploader: 'requests' library not installed")
+            self._warn("no_requests", "HttpUploader: 'requests' library not installed")
             return
 
         for path in files:
@@ -318,14 +328,16 @@ class HttpUploader:
                     )
                 if r.status_code == 200:
                     self._uploaded[str(path)] = mtime
+                    self._warn_at.pop(f"upload_{path.name}", None)  # clear on success
                     logger.debug(f"HttpUploader: OK {path.name}")
                 else:
-                    logger.warning(
+                    self._warn(
+                        f"upload_{path.name}",
                         f"HttpUploader: {path.name} -> HTTP {r.status_code}: "
                         f"{r.text[:120]}"
                     )
             except Exception as exc:
-                logger.warning(f"HttpUploader: {path.name} failed: {exc}")
+                self._warn(f"upload_{path.name}", f"HttpUploader: {path.name} failed: {exc}")
 
     def _do_cleanup(self) -> None:
         try:
@@ -342,13 +354,14 @@ class HttpUploader:
                 verify=False,   # accept self-signed / untrusted certs
             )
             logger.info(f"HttpUploader cleanup: {r.text[:120]}")
+            self._warn_at.pop("cleanup", None)  # clear on success
             # Forget mtime records for ptycho files so they get re-uploaded
             with self._lock:
                 to_remove = [k for k in self._uploaded if "/S" in k or "\\S" in k]
             for k in to_remove:
                 self._uploaded.pop(k, None)
         except Exception as exc:
-            logger.warning(f"HttpUploader cleanup failed: {exc}")
+            self._warn("cleanup", f"HttpUploader cleanup failed: {exc}")
 
 
 # ---------------------------------------------------------------------------